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Journal articles on the topic 'Flux lumineux'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Vaissiere, Dimitri, Murielle Bach, and Alain Cornet. "Caractérisation par rayons X et mesure de flux lumineux rétrodiffusé de surfaces oxydées." Matériaux & Techniques 91, no. 5-6 (2003): 27–32. http://dx.doi.org/10.1051/mattech/200391050027.

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2

Pandard, P., and P. Vasseur. "Biocapteurs pour le contrôle de la toxicité des eaux : application des bioélectrodes algales." Revue des sciences de l'eau 5, no. 3 (April 12, 2005): 445–61. http://dx.doi.org/10.7202/705141ar.

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L'amélioration de la qualité de l'environnement passe par la réalisation de contrôles de toxicité in situ et en continu des sources de pollution ou des milieux contaminés, à l'aide de systèmes automatisés à réponse rapide. Les systèmes donnant une réponse en temps réel permettent d'intervenir immédiatement à la source, d'interrompre le rejet d'un flux toxique et de prévenir ainsi les accidents de pollution. Ce type de stratégie ne peut être développé qu'au moyen de biocapteurs : les méthodes d'essais conventionnelles n'autorisent que des contrôles de toxicité épisodiques, en laboratoire, effectués dans des conditions statiques quelque peu éloignées des conditions dynamiques. Nous nous sommes intéressés à la mesure de l'activité photosynthétique d'algues unicellulaires immobilisées. La photosynthèse induite par des stimuli lumineux est en effet un processus dont la réponse est immédiate et aisément mesurable à l'aide de transducteurs électrochimiques. Il apparaît donc intéressant d'utiliser ces réactions photosynthétiques pour la détection des polluants. Deux dispositifs mesurant l'activité photosynthétique d'algues unicellulaires ont été testés. Le premier dispositif mesure le transfert d'électrons le long de la chaîne photosynthétique lors d'une illumination des micro-organismes. Le second système permet de quantifier la production d'oxygène résultant de cette excitation lumineuse. La mesure du transfert d'électrons photosynthétiques nécessite l'addition d'une substance oxydo-réductible (médiateur) dans le milieu pour capter ces électrons. De la série de médiateurs testés, seuls les dérivés à caractère lipophile (2,6-diméthylbenzoquinone et p-benzoquinone) ont permis de mesurer un transfert d'électrons. Toutefois la durée de vie de ce biocapteur s'est révélée limitée à moins de 24 heures, ce qui exclut toute utilisation en continu. Le second dispositif développé présente en revanche une longévité d'une semaine, ce qui le rend intéressant en vue d'une utilisation in situ. Les performances de ce capteur à oxygène ont été testées sur des produits de type herbicides, cyanures, métaux et comparées aux valeurs obtenues à l'aide de tests algues classiques ou de méthodes de détection rapide de la toxicité.

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3

Gentile, C., M. L. Rastello, G. Rossi, and P. Soardo. "Luminous flux measurement." Lighting Research & Technology 20, no. 4 (December 1988): 189–93. http://dx.doi.org/10.1177/096032718802000406.

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4

Quan, Cao Xuan, Vu Khanh Xuan, Luu Thi Lan Anh, and Vo Thach Son. "Study of Temperature Effect on Luminous Flux of High Power Chip on Board Light Emitting Diode." Communications in Physics 24, no. 3 (August 21, 2014): 267. http://dx.doi.org/10.15625/0868-3166/24/3/4231.

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High power chip on board light emitting diode (HPCOBLED) are a promising solid state light technology for a variety of lighting applications. In this study, we studied temperature effect on luminous flux of HPCOBLED using VMI-PR-001 system of Vietnam Metrology Institute. The results according to the temperature Tc is increasing, luminous flux reduced. Especially HPCOBLED is larger power, decreasing luminous flux is larger. Reason of this is chance power. HPCOBLED model describes the temperature affection on luminous flux of HPCOBLED. The results of HPCOBLED model matched with that measured by the luminous flux measurement system (VMI-PR-001, Vietnam).

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5

Nesterkina, Nina P., Yulia A. Zhuravlyova, Evgeny A. Kuznetsov, Evgeny S. Shichavin, and Maksim S. Shishkanov. "Research Of Long-Term Lighting Tests Of Led retrofit And Filament Lamps." Issue 03-2021, no. 03-2021 (June 2021): 62–69. http://dx.doi.org/10.33383/2021-019.

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The paper analyzes the results of comparative studies of the light and engineering characteristics of LED retrofit lamps and filament lamps of the A60 form factor of nine manufacturers: Uniel (Russia – China), JazzWay (Russia – China), Philips (the Netherlands), Ecola (China), Wolta (Germany), Feron (Russia), Rev (Germany), Osram (Germany), Forza (China) – luminous flux, power consumption, correlated colour temperature, luminous efficacy, flicker index, spectral distribution of the radiation flux density during 6000 hours of lamps burning. The test results show that: а) the measured value of the initial luminous flux of all LED retrofit lamps corresponds to the declared; б) the measured value of the initial luminous flux of filament LED lamps is lower than the declared values by an average of 19 %; в) high value of the luminous flux maintenance factor after 6000 hours of burning among LED retrofit lamps showed Uniel LED10 W 4000 К (94.5 %), Philips Essential LED9 W 6500 K (96.2 %), Wolta LX 12 W 3000 К (95.3 %), for JazzWay PLED-SP 10 W 5000 K and Ecola Classic LED10.2 W 4000 K lamps, the luminous flux maintenance factor was less than 90 %; г) the luminous flux maintenance factor after 6000 hours of burning of all filament LED lamps ranged from 91.3 % to 96.4 %, except for the Feron LB‑57 7 W 2700 K lamp – 89.3 %. According to the test results, only for the Uniel LED10 W 4000 K lamp, the measured values of the light and engineering characteristics and the flicker index, including after 6000 hours of burning, correspond to the declared ones. The high luminous flux maintenance factor after 6000 hours of burning allows this lamp to be classified as A-category in terms of decreasing luminous flux.

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6

Li, Jian, and Kun Wang. "Design of Polygon Prism Optical Lens for LED Street Lamps." Advanced Materials Research 756-759 (September 2013): 4541–44. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.4541.

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High-power light emitting diode (LED) develops greatly owing to its high energy efficiency, high color rendering and long life. However, it is important to design a secondary optical lens for the LED lamps to obtain a good output efficiency and light distribution pattern. The purpose of the secondary optical design for light emitting diode (LED) illumination is to rearrange the luminous flux output of LED and then achieve the desired luminous intensity distribution. In this paper, a polygon prism lens for street lamps was designed and the desired illumination was achieved. The design procedure of the polygon prism lens is presented. The simulation of the street lamps is implemented using Tracepro 7.0. The results show that the polygon prism lens can distribute the luminous flux accurately and reasonably. The luminous flux can be saved as much as possible and a rectangular distribution of luminous flux is attained.

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7

Kovalenko, Olga Yu, and Yulia A. Zhuravlyova. "Analysis of Characteristics of Halogen and LED Automobile Lamps." Light & Engineering, no. 04-2020 (August 2020): 57–62. http://dx.doi.org/10.33383/2019-067.

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This work contains analysis of characteristics of automobile lamps by Philips, KOITO, ETI flip chip LEDs, Osram, General Electric (GE), Gtinthebox, OSLAMPledbulbs with H1, H4, H7, H11 caps: luminous flux, luminous efficacy, correlated colour temperature. Characteristics of the studied samples are analysed before the operation of the lamps. The analysis of the calculation results allows us to make a conclusion that the values of correlated colour temperature of halogen lamps are close to the parameters declared by manufacturers. The analysis of the study results has shown that, based on actual values of correlated colour temperature, it is not advisable to use LED lamps in unfavourable weather conditions (such as rain, fog, snow). The results of the study demonstrate that there is a slight dispersion of actual values of luminous flux of halogen lamps by different manufacturers. Maximum variation between values of luminous flux of different lamps does not exceed 14 %. The analysis of the measurement results has shown that actual values of luminous flux of all halogen lamps comply with the mandatory rules specified in the UN/ECE Regulation No. 37 and luminous flux of LED lamps exceeds maximum allowable value by more than 8 %. Luminous efficacy of LED lamps is higher than that of halogen lamps: more than 82 lm/W and lower power consumption. The results of the measurements have shown that power consumption of a LED automobile lamp is lower than that of similar halogen lamps by 3 times and their luminous efficacy is higher by 5 times.

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8

Tin, Phu Tran, Tran Hoang Quang Minh, Nguyen Huu Khanh Nhan, Hsiao-Yi Lee, and Tran Thanh Trang. "Green-emitting CaF2:Ce3+,Tb3+ phosphor: selection for improving luminous flux and color quality of conformal geometry white LED lamps." Materials Science-Poland 36, no. 4 (December 1, 2018): 563–69. http://dx.doi.org/10.2478/msp-2018-0095.

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AbstractIn the last decades, new solutions for improving lighting properties of white LED lamps (WLEDs) have been the main research direction in optoelectronics. In this paper, a modern approach for enhancing luminous flux and color quality of white LED lamps was presented. By mixing green-emitting CaF2:Ce3+,Tb3+ phosphor with yellow-emitting YAG:Ce phosphor compound, the luminous flux and color quality of white LED lamps with conformal phosphor geometry (CPG) increased significantly. From the obtained results it follows that, the luminous flux increased more than 1.5 times, and the correlated color temperature deviation decreased more than 4 times in comparison with the non-green-emitting CaF2:Ce3+,Tb3+ phosphor. The presented research shows that the green-emitting CaF2:Ce3+,Tb3+ phosphor could become a good candidate for enhancing luminous flux and color quality of white LED lamps.

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9

Yan, Jin-Ren, De-Cong Li, Zhi-Kun Wang, and Wen-Ping Rao. "An Iterative Method for the Uniformity Improvement of Edge-Lit Backlight." Advances in OptoElectronics 2016 (September 28, 2016): 1–5. http://dx.doi.org/10.1155/2016/1760260.

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A simple iterative optimization method is developed to improve the exiting light uniformity of the edge-lit backlight module. The method uses the relative deviation of the average luminous flux of the entire light guide plate (LGP) and the luminous flux of each region as constraint criterion and the ratio of the luminous flux of each region to the average luminous flux of the LGP as adjustment coefficient to adjust the density of the microstructures in each region. This process loops until the relative deviations of all regions meet a prespecified threshold value. A LGP based on microprism structure is presented to validate the method. The initial values, which represent the size of the microstructures manufactured on the bottom surfaces of the LGP, d0-dependent luminous fluxes, microstructure size distributions, iterations of the LGP, and the relative deviation of each region are discussed. The simulation results show that it is a very practical method for the uniformity improvement of the backlight when an appropriate initial value is selected and the final uniformity is better than 90% after optimization.

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10

Tabaka, Przemyslaw. "Pilot Measurement of Illuminance in the Context of Light Pollution Performed with an Unmanned Aerial Vehicle." Remote Sensing 12, no. 13 (July 2, 2020): 2124. http://dx.doi.org/10.3390/rs12132124.

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This article presents the methodology and results of pilot field illuminance measurements using an unmanned aerial vehicle (UAV). The main goal of the study was to quantify the luminous flux emitted in the upper hemisphere (toward the sky) based on obtained measurement data. The luminous flux emitted toward the sky is the source of undesirable light pollution. For test purposes, a height-adjustable mobile park lantern was constructed, at the top of which any type of luminaire can be installed. In the pilot measurements, two real opal sphere-type luminaires were considered. The lantern was situated in an open area located away from a large city agglomeration. To determine the unusable luminous flux, illuminance was measured, placing the necessary measuring equipment on board a UAV. The measurements were supplemented with the registration of illuminance on the ground upon which the lantern was installed. Based on these data, the useful luminous flux was calculated. The findings show that UAVs may be successfully used for the assessment of the influence of lighting on the light pollution effect.

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11

Li, Mengtian, Jun Zou, Wengjuan Wu, Mingming Shi, Bobo Yang, Wenbo Li, and Bin Guo. "Effect of Different Welding Methods on Flip-Chip LED (FC-LED) Filament Properties." Applied Sciences 8, no. 11 (November 15, 2018): 2254. http://dx.doi.org/10.3390/app8112254.

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This paper investigates the effect of two different welding methods, direct welding (DW) and vacuum furnace welding (VFW), on flip-chip light-emitting diode (FC-LED) filament properties. Shearing force, SEM, steady-state voltage, steady-state luminous flux, and change of photoelectric performance with aging time were employed to characterize the differences in filament properties between the two welding methods. The shearing test revealed that the average shearing force of the VFW group was higher than that of the DW group, but the two groups followed the standard. Furthermore, the microstructure of the VFW group fault was more smoother, and the voids were fewer and smaller based on the SEM test results. The steady-state voltage and luminous flux revealed that the VFW group had a more concentrated voltage and a higher luminous flux. The aging data revealed that the steady-state voltage change rate of both groups was not very different, and both luminous flux maintenance rates of the VFW group were higher than those of the DW group, but all were within the standard range. In conclusion, if there is a higher requirement for filament in a practical application, such as the filament is connected in series or in parallel and needs a higher luminous flux, it can be welded using vacuum furnace welding. If the focus is on production efficiency and the high performance of filaments is not required, direct welding can be used.

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12

Irshad, Liu, Arshad, Sohail, Murthy, Khokhar, and Uba. "A Novel Localization Technique Using Luminous Flux." Applied Sciences 9, no. 23 (November 21, 2019): 5027. http://dx.doi.org/10.3390/app9235027.

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As global navigation satellite system (GNNS) signals are unable to enter indoor spaces, substitute methods such as indoor localization-based visible light communication (VLC) are gaining the attention of researchers. In this paper, the systematic investigation of a VLC channel is performed for both direct and indirect line of sight (LoS) by utilizing the impulse response of indoor optical wireless channels. In order to examine the localization scenario, two light-emitting diode (LED) grid patterns are used. The received signal strength (RSS) is observed based on the positional dilution of precision (PDoP), a subset of the dilution of precision (DoP) used in global navigation satellite system (GNSS) positioning. In total, 31 × 31 possible positional tags are set for a given PDoP configuration. The values for positional error in terms of root mean square error (RMSE) and the sum of squared errors (SSE) are taken into consideration. The performance of the proposed approach is validated by simulation results according to the selected indoor space. The results show that the position accuracy enhanced is at short range by 24% by utilizing the PDoP metric. As confirmation, the modeled accuracy is compared with perceived accuracy results. This study determines the application and design of future optical wireless systems specifically for indoor localization.

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13

Корнага, Василь Ігорович, Юрій Юрійович Ковтун, Дар’я Олександрівна Калустова, Олександр Сергійович Олійник, Андрій Володимирович Рибалочка, and Віктор Михайлович Сорокін. "Features measurement of luminous flux by goniometer." Ukrainian Metrological Journal, no. 4 (December 29, 2016): 34–37. http://dx.doi.org/10.24027/2306-7039.4.2016.112116.

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14

Pons, Alicia, Joaquĺn Campos, and Ferhat Sametoglu. "Bilateral comparison of luminous flux (EURAMET.PR-K4.3)." Metrologia 56, no. 1A (January 1, 2019): 02003. http://dx.doi.org/10.1088/0026-1394/56/1a/02003.

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15

Ding, Xinrui, Ruixiang Qian, Liang Xu, Zongtao Li, Jiasheng Li, Caiman Yan, and Binhai Yu. "A Luminous Efficiency-Enhanced Laser Lighting Device with a Micro-Angle Tunable Filter to Recycle Unconverted Blue Laser Rays." Micromachines 12, no. 10 (September 23, 2021): 1144. http://dx.doi.org/10.3390/mi12101144.

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In this work, a phosphor converter with small thickness and low concentration, based on a micro-angle tunable tilted filter (ATFPC), was proposed for hybrid-type laser lighting devices to solve the problem of silicone phosphor converters’ carbonizing under high-energy density. Taking advantage of the filter and the scattering characteristics of microphosphors, two luminous areas are generated on the converter. Compared with conventional phosphor converters (CPCs), the lighting effects of ATFPCs are adjustable using tilt angles. When the tilt angle of the micro filter is 20°, the luminous flux of the ATPFCs is increased by 11.5% at the same concentration; the maximum temperature (MT) of ATFPCs is reduced by 22.8% under the same luminous flux and the same correlated color temperature (CCT) 6500 K. This new type of lighting device provides an alternative way to improve the luminous flux and heat dissipation of laser lighting.

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16

Kohmoto, K., Y. Nakagawa, H. Kondo, K. Bando, Y. Morikawa, A. Takekuma, J. Okazaki, K. Yamada, and K. Suzuki. "Round-Robin Testing of LED luminous intensity and total luminous flux measurement." JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN 84, Appendix (2000): 287. http://dx.doi.org/10.2150/jieij1980.84.appendix_287.

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17

Scums, Dmitriy, and Boris Eroshenko. "High power LED based standard lamps for luminous flux and luminous intensity." Ukrainian Metrological Journal, no. 1 (March 29, 2019): 33–37. http://dx.doi.org/10.24027/2306-7039.1.2019.164630.

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18

Lampret, V., J. Peternelj, and A. Krainer. "Luminous flux and luminous efficacy of black-body radiation: an analytical approximation." Solar Energy 73, no. 5 (November 2002): 319–26. http://dx.doi.org/10.1016/s0038-092x(02)00119-6.

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19

Sokmen, Kemal Furkan, and Osman Bedrettin Karatas. "Research Into The Junction Temperature And Power Of New Led Modules Generation In Dependence On Variable Parameters." Light & Engineering, no. 05-2020 (October 2020): 106–15. http://dx.doi.org/10.33383/2019-101.

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In this research, the change in the junction temperature and luminous flux of a new generation LED module depending on variables such as radiation, lens piece, ambient temperatures, currents, and quantity of elements had been studied. Commercial software FloEFD2019 was used in the finite volume analysis made during the study. The analyses were verified by experiments. On basis of the analysis, a solution was obtained that does not depend on the number of elements. The force of gravity was taken into account. While the ambient temperatures were taken as Ta = 23 °C and 40 °C, and the radiation value as 1009 W/m2, currents as 140 mA, 160 mA, 180 mA, 200 mA, 220 mA and 240 mA, meanwhile, samples numbers on PCB were taken as 101 and 202. In order to determine the effect of the lens piece located on the LED module, the analysis was repeated with and without using the lens. As a result of the study, it was found that the increase in ambient temperature and radiation has an adverse effect on the temperature Tj and luminous flux. It has been observed that changing samples number has a negligible effect on luminous flux and temperature Tj. It was found that the use of radiation and lenses are the most important factors affecting the luminous flux of the module.

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20

Takasu, Hirotsugu, Masahiro Miyata, Kiyomi Sakoda, and Kenji Kimura. "Luminous flux monitoring system for tunnel lighting luminaire." JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN 76, Appendix (1992): 36. http://dx.doi.org/10.2150/jieij1980.76.appendix_36.

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21

Matamoros, Carlos H., Yoshi Ohno, Joanne Zwinkels, Jorge A. Cogno, and Iakyra B. Couceiro. "SIM key comparison for luminous flux. SIM.PR-K4." Metrologia 53, no. 1A (January 1, 2016): 02002. http://dx.doi.org/10.1088/0026-1394/53/1a/02002.

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22

Liu, H., Y. D. Lin, C. Z. Yang, and J. Yu. "APMP comparison on luminous flux units (APMP.PR-K4)." Metrologia 55, no. 1A (December 20, 2017): 02001. http://dx.doi.org/10.1088/0026-1394/55/1a/02001.

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23

Rastello, Maria Luisa, Elio Miraldi, and Paolo Pisoni. "Luminous-flux measurements by an absolute integrating sphere." Applied Optics 35, no. 22 (August 1, 1996): 4385. http://dx.doi.org/10.1364/ao.35.004385.

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24

Bonhoure, J. "Sixth Comparison of National Standards of Luminous Intensity and of Luminous Flux (1985)." Metrologia 24, no. 4 (January 1, 1987): 157–62. http://dx.doi.org/10.1088/0026-1394/24/4/001.

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25

Yang, Yong, Wen Yuan Han, and Lei Wang. "Study on the Highway Tunnel Lighting with Spectrum Superposition." Advanced Materials Research 512-515 (May 2012): 2713–17. http://dx.doi.org/10.4028/www.scientific.net/amr.512-515.2713.

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The lighting level of highway tunnel is usually under mesopic vision condition, but the traditional luminance and illuminance test are corrected by photopic vision spectral luminous efficiency. According to the difference of spectral luminous efficiency between photopic and mesopic, the lighting with different peak wavelength would provide various ratios of radiation / photometric flux. Four kinds of narrowband light sources with the same tested flux were stacked up in white LED and HPS respectively, through equivalent brightness calculation, the most efficient spectral wavelength were obtained under mesopic condition.

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26

Yepsen, Erin, Zaid Haddadin, Danielle A. Rankin, Rendie McHenry, Laura S. Stewart, and Natasha B. Halasa. "685. Comparison of Singleplex qPCR and the Luminex MAGPIX Platform for the Detection of Viral Pathogens." Open Forum Infectious Diseases 7, Supplement_1 (October 1, 2020): S396. http://dx.doi.org/10.1093/ofid/ofaa439.877.

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Abstract Background Various respiratory molecular assays are available, each with different characteristics and advantages that make them uniquely valuable. The objective of this study was to compare rates of viral detection using singleplex and multiplex platforms in a research setting. Methods A prospective viral surveillance study was conducted in Davidson County, TN. Infants under one year who presented with fever and/or respiratory symptoms were enrolled from the outpatient, emergency department and inpatient settings. Nasal swabs were collected and tested for influenza A (FluA), influenza B (FluB), human metapneumovirus (MPV), respiratory syncytial virus A and B (RSVA and RSVB), human adenovirus (AdV), parainfluenza 1, 2, 3, and 4 (PIV1-4) and SARS-2-CoV by both singleplex qPCR and the Luminex NxTAG Respiratory Pathogen and NxTAG CoV Extended panels. The rhinovirus/enterovirus, human bocavirus, Chlamydophila pneumoniae, Mycoplasma pneumoniae and coronavirus HKU1, NL63, 229E and OC43 results from the Luminex panel were excluded because singleplex qPCR was not performed on those targets. For singleplex qPCR results, cycle threshold (Ct) values were used as a surrogate for viral load, with a higher Ct value indicating a lower viral load. Results A total of 112 nasal specimens were tested by both singleplex qPCR and Luminex, of which 65 were positive for at least one virus by either platform and 56 had a virus detected on both platforms (Figure 1). Seven specimens were positive by singleplex qPCR only and two were positive by Luminex only (Figure 1). The targets positive by singleplex qPCR only included FluB, RSVA, AdV and PIV2 and those positive by Luminex only included FluA H1N1 and RSVB (Figure 2). Specimens that were positive only on the singleplex assay had a higher average Ct value than those that were positive on both assays, indicating a lower viral load (Figure 3). Figure 1 Figure 2 Figure 3 Conclusion The multiplex assay identified 89% of the total viruses detected while singleplex qPCR identified 97% of the total viruses detected. Lower viral loads may contribute to false negative results on the multiplex platforms. Future studies with larger sample sizes are needed in order validate our findings. Disclosures Erin Yepsen, BS, Sanofi Pasteur (Grant/Research Support, Research Grant or Support) Zaid Haddadin, MD, CDC (Grant/Research Support, Research Grant or Support)Quidel Corporation (Grant/Research Support, Research Grant or Support)sanofi pasteur (Grant/Research Support, Research Grant or Support) Danielle A. Rankin, MPH, CIC, Sanofi Pasteur (Grant/Research Support, Research Grant or Support) Natasha B. Halasa, MD, MPH, Genentech (Other Financial or Material Support, I receive an honorarium for lectures - it’s a education grant, supported by genetech)Karius (Consultant)Moderna (Consultant)Quidel (Grant/Research Support, Research Grant or Support)Sanofi (Grant/Research Support, Research Grant or Support)

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Karakova, Tatiana, Sergey Kolesnikov, Yana Radulova, and Julia Vorontsova. "The formation of objects of the architectural environment with art perforated elements." E3S Web of Conferences 91 (2019): 05009. http://dx.doi.org/10.1051/e3sconf/20199105009.

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The perforation principle of objects in environmental design is considered in this article, as well as the formation of objects of an architectural environment with the help of the perforation principle, and the interaction of perforated elements with shapes and luminous flux. This research improves the traditional knowledge of functional use of perforated surfaces (such as sun protection, soundproofing, health and safety requirements) in architectural and design objects. The research also systematizes and structures the methods of using them with the luminous flux in environmental design of objects in order to find some new forms and compositional effects.

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Zhu, Ming Jun, Hong Yong Huang, Zhi You Guo, and Dong Xing Cao. "Optimized Design and Performance Research of the High-Voltage LEDs Chipset." Applied Mechanics and Materials 389 (August 2013): 383–88. http://dx.doi.org/10.4028/www.scientific.net/amm.389.383.

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This paper introduces a technology that 16 LED chips are integrated on a substrate to form a new type of high-voltage LEDs chipset. Monte Carlo method and Finite Element Method simulation are used to optimize the structure for making the best in the luminous flux, luminous efficiency and heat dissipation. Firstly, By the comparison of three kinds of high-voltage LEDs, the vertical structure, inverted trapezoidal structure and trapezoidal structure, the results show that the luminous efficiency of the entire high-voltage LEDs chipset used trapezoidal structure is the highest, the empirical data is 41.522%, which is 2.12 times than the vertical structure; this paper introduces the heat transfer performance of three kinds of high-voltage LEDs, the empirical data are 88.374°C, 82.652°C and 93.725°C. We can see that the vertical structure is the best. This paper also optimizes the high-voltage LEDs chipset, under the circumstances of the constant chip area, we change the area of the single chips, prompting the spacing between the single chips change. We get the best single chip area and single chip change, under this circumstance, we can get the best luminous efficiency and luminous flux.

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Lei, Yu, Fang Fang Fu, Li Zheng, Zhi Qiang Wang, Xin Zhao, and Hai Lin. "Absolute Luminous Flux and Quantum Yield of Sm³⁺-Doped Cadmium-Aluminum-Silicate Glasses under the Pumping of Blue Light Emitting Diode." Applied Mechanics and Materials 275-277 (January 2013): 1974–77. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.1974.

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Absolute luminous flux and quantum yield for multichannel transition emissions have been determined in samarium ion (Sm3+)-doped cadmium-aluminum-silicate (CAS) glasses under the pumping of blue light emitting diode (LED) using an integrating sphere of 30 cm diameter, which connected to a CCD detector with a 400 μm-core optical fiber. The radiant flux and luminous flux for the visible transition emissions (550–750 nm) of Sm3+under the blue LED excitation were solved to be 123 μW and 32 mlm, respectively, which occupied 1.51% and 7.16% of the whole. The total quantum yield of the visible fluorescence of Sm3+has been calculated to be 2.52%. Investigation on optical radiation parameters for multichannel visible transition emissions of Sm3+in CAS glasses provides a reference in developing luminescence and display materials.

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30

Polidan, Ronald S., and Roberto Stalio. "Voyager Observations of Hot Luminous Stars." Symposium - International Astronomical Union 116 (1986): 117–19. http://dx.doi.org/10.1017/s007418090014879x.

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This is a progress report on a study of the far-UV spectra of hot stars observed with the Voyager ultraviolet spectrometers (UVS); we discuss UV flux distribution and variability of a set of early type high luminosity stars.

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31

Ohkubo, Kazuaki, Mamoru Saito, Katsuhisa Hirokawa, Tomokazu Takahashi, and Hisashi Shiga. "Comparison of Total Luminous Flux for Integrating Sphere Photometers." JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN 98, no. 8A (2014): 362–68. http://dx.doi.org/10.2150/jieij.98.362.

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32

Winter, S., M. Lindemann, W. Jordan, U. Binder, and M. Anokhin. "Convenient integrating sphere scanner for accurate luminous flux measurements." Metrologia 46, no. 4 (June 2, 2009): S248—S251. http://dx.doi.org/10.1088/0026-1394/46/4/s22.

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33

Lindemann, Matthias, Robert Maass, and Georg Sauter. "Final report on regional comparison EURAMET.PR-K4: luminous flux." Metrologia 52, no. 1A (January 1, 2015): 02001. http://dx.doi.org/10.1088/0026-1394/52/1a/02001.

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34

Badeeva, E. A., T. I. Murashkina, and M. M. Chukareva. "Luminous flux control in a fiber-optic measuring transducer." Journal of Physics: Conference Series 803 (January 2017): 012013. http://dx.doi.org/10.1088/1742-6596/803/1/012013.

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35

Szylowski, Martin, Michele Mossman, David Barclay, and Lorne Whitehead. "Novel fiber-based integrating sphere for luminous flux measurements." Review of Scientific Instruments 77, no. 6 (June 2006): 063102. http://dx.doi.org/10.1063/1.2204582.

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36

Shitomi, Hiroshi, and Ichiro Saito. "Absolute Total Luminous Flux Measurement Using a New Goniophotometer." JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN 87, Appendix (2003): 189. http://dx.doi.org/10.2150/jieij1980.87.appendix_189.

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37

OHKUBO, Kazuaki, Shunsuke MISHIMA, and Kosei OSHIMA. "Total Luminous Flux Measurement System Using Integrating Hemisphere Photometer." Journal of Light & Visual Environment 35, no. 1 (2011): 76–85. http://dx.doi.org/10.2150/jlve.35.76.

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38

Sardinha, André, Ivo Ázara, Miguel Torres, Thiago Menegotto, Hans Peter Grieneisen, Giovanna Borghi, Iakyra Couceiro, Alexandre Zim, and Filipe Muller. "Development of a LED based standard for luminous flux." Journal of Physics: Conference Series 975 (March 2018): 012029. http://dx.doi.org/10.1088/1742-6596/975/1/012029.

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39

Stupin, I. V., A. M. Dombrovskii, A. I. Novokshonov, L. L. Belova, and G. G. Belous. "Mutagenic action of the luminous flux of ionized plasma." Bulletin of Experimental Biology and Medicine 110, no. 4 (October 1990): 1410–11. http://dx.doi.org/10.1007/bf00842302.

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40

Chakrabarti, M., A. Thorseth, J. Jepsen, D. Dan-Corell, and C. Dam-Hansen. "Monte Carlo analysis of a control technique for a tunable white lighting system." Lighting Research & Technology 50, no. 5 (April 24, 2017): 716–28. http://dx.doi.org/10.1177/1477153517691332.

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A simulated colour control mechanism for a multi-coloured LED lighting system is presented. The system achieves adjustable and stable white light output and allows for system-to-system reproducibility after application of the control mechanism. The control unit works using a pre-calibrated lookup table for an experimentally realized system, with a calibrated tristimulus colour sensor. A Monte Carlo simulation is used to examine the system performance concerning the variation of luminous flux and chromaticity of the light output. The inputs to the Monte Carlo simulation are variations of the LED peak wavelength, the LED rated luminous flux bin, the influence of the operating conditions, ambient temperature, driving current and the spectral response of the colour sensor. The system performance is investigated by evaluating the outputs from the Monte Carlo simulation. The outputs show that the applied control system yields an uncertainty on the luminous flux of 2.5% within a 95% coverage interval which is a significant reduction from the 8% of the uncontrolled system. A corresponding uncertainty reduction in Δu ′v ′ is achieved from an average of 0.0193 to 0.00125 within 95% coverage range after using the control system.

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41

Huang, De Zhong, Ji Hua Wu, Guo Yong Xu, Feng Ruan, Xiao Bao Zhao, and Guo Hua Wang. "A Life Prediction Model for LEDs Lamps Based on the Thermal Life Theory." Advanced Materials Research 941-944 (June 2014): 571–74. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.571.

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The photometric, electrical, thermal and life features of LEDs are highly dependent on each other. All these factors should be considered together in order to optimize the operating point of LEDs. A thermal life theory about LEDs is developed. This theory shows the inner inks among photometric thermal and 1ife features of a LED. A life prediction model of LEDs and the relationship between output luminous flux and lifetime was found out by this theory. The life of LEDs can be predicted and find the proper operating point, at which the LED will generate the maximum amount of luminous flux in its total life cycle.

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42

Phuong Loan, Nguyen Thi, and Nguyen Doan Quoc Anh. "Y2O3:Ho3+ and ZnO:Bi3+: a selection for enhancing color quality and luminous flux of WLEDs." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 5 (October 1, 2020): 5162. http://dx.doi.org/10.11591/ijece.v10i5.pp5162-5167.

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As the luminescence industry develops, the white light light-emitting diode (LED) package with a single chip and a single phosphor although produces good luminous flux but has a poor color rendering index (CRI) can no longer fulfill the requirements of modern lighting applications. Therefore, this research is conducted to response to the urgent demands of improving other lighting qualities of WLED while maintaining high luminous efficiency. To achieve this target, we applied the new WLED package, which contains multi-chips and multi-phosphor layers, and have obtained outstanding results in both CRI and luminous efficacy. Two types of phosphor used in the WLED package are Y2O3:Ho3+ and ZnO:Bi3+. A color configuration model is also developed to adjust the shading of the white-light LED module. The results of this research show that the triple-layer phosphorhas the best performance when applied in a white-light LED package, which is demonstrated through better color quality, CRI and luminous efficacy, The manufacturers can rely on this research to produce the optimal-quality WLED, or WLED that is appropriate to their quality demands.

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43

Chen, Kuo-Ju, Hau-Vei Han, Hsin-Chu Chen, Chien-Chung Lin, Shih-Hsuan Chien, Chung-Ching Huang, Teng-Ming Chen, Min-Hsiung Shih, and Hao-Chung Kuo. "White light emitting diodes with enhanced CCT uniformity and luminous flux using ZrO2 nanoparticles." Nanoscale 6, no. 10 (2014): 5378–83. http://dx.doi.org/10.1039/c3nr06894c.

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44

Mozafari Vanani, Lotfali, Mani Ghanbari, and Hadi Ghasemi Zavaragh. "Optimization and Experimental Validation of Automotive Bulbs." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 235, no. 10-11 (March 19, 2021): 2893–903. http://dx.doi.org/10.1177/09544070211004462.

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In a vehicle, bulbs called the P-group are responsible for warning other drivers or pedestrians and they are known as signal bulbs. Signal bulbs have been used to emit warning and hazard signs in parts such as brake lights, direction indicator, hazard lights (night vision) as well as tail bulbs and car park alarms. There has been limited researches on the photometric characteristics of these lamps, but a review of these studies revealed that no detailed research has yet been done on optimizing these characteristics, and there is a scientific gap. In this study, factors affecting the service life and luminous flux were evaluated by using Taguchi design of experiments method. The results showed that the two factors of weight percent composition of bubble filling neutral gases and the volumetric efficiency of gases injected into the bubble had the most influence on the target parameters. Experimental results showed that the optimum composition of neutral gases injected into the bulb bubble can extend the bulb service life to approximately 341 h, which is three times the service life of a bulb with the inappropriate composition of fill gases. Then the optimum state of the service life and the luminous flux were determined to meet the reference standards. Although the service life and luminous flux parameters were able to reach 341 h and 513 lumens in the maximized state, however, in the optimum state with satisfying reference standards, the service life and luminous flux were 330 h and 463 lumens, respectively. Then, the bulb bubble filling with inert neutral gases and its effect on the bulb service life was investigated. The results showed that if the volumetric efficiency of gas injection increased from the normal 75%–100%, the service life of the test lamps would be improved by about 10%.

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45

Gong, Yu Bing, and Ruan Ji Tian. "Impact of the Phosphors on the Conformal Coating LED by Optical Simulation." Advanced Materials Research 834-836 (October 2013): 1167–71. http://dx.doi.org/10.4028/www.scientific.net/amr.834-836.1167.

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The conformal coating phosphor converted light emitting diode (LED) is one of the important high power white LED. The thickness, concentration and concentration distribution of the phosphor layer has a critical influence on the LED optical performance. Previous literature mainly focus on the luminous flux of the LED. Few are involved with the relationship between the concentration and the correlated color temperature (CCT), and angular color uniformity (ACU) of LED. Based on the ray-tracing simulation, the luminous flux, CCT and ACU affected by the phosphor thickness, concentration and concentration distribution were obtained and studied. The results provide effective references for the phosphor coating process design and optical performance analysis of conformal coating LED.

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46

Zalesinska, Malgorzata, Julita Zablocka, Krzysztof Wandachowicz, and Agata Raczak. "Forecasting long term lumen maintenance of LED lamps." ITM Web of Conferences 19 (2018): 01042. http://dx.doi.org/10.1051/itmconf/20181901042.

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Due to the very high life of LED lamps, amounting to tens of thousands of hours, the life declared by the manufacturer is most often life determined on the basis of the method of forecasting the long term lumen maintenance. Life forecasting is based on operational measurements of the luminous flux drop over a period of at least up to 6000 h every 1000 h and extrapolation of the obtained results with an appropriate exponential curve. The article presents the results of measurements of luminous flux changes in the range of 0 to 9000 h of operation of light sources. The analysis of the obtained results was carried out and the life of the tested lamps was estimated.

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47

Wang, Kun, Jian Li, and Shi Qing Wang. "Optimization of Xenon Gas Discharge Flat Panel Lamps." Advanced Materials Research 571 (September 2012): 256–60. http://dx.doi.org/10.4028/www.scientific.net/amr.571.256.

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A xenon gas discharge flat panel lamp is made and the influence factors: the gas pressures, the gas compositions and gas gap on the luminous efficacy of the xenon gas discharge flat panel lamps were investigated. Marked increments of the luminous efficacy of the lamps were observed by optimizing the structures and the discharge conditions. The results showed that the xenon gas discharge flat panel lamps with a luminance of above10,000 cd/m2, a luminous flux of above 450 lm, a size of 126×87 mm and an luminous efficacy of about 43 lm/W could be attained at about 450 torr xenon, 0.71 mm gap distance and 2.8 mm front glass layer thickness. The factors which influenced the luminous efficacy were discussed in the end.

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48

Pronin, M. A., and E. V. Churkina. "Effect of light switch illumination on total energy consumption." Safety and Reliability of Power Industry 14, no. 2 (July 28, 2021): 151–56. http://dx.doi.org/10.24223/1999-5555-2021-14-2-151-156.

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The question of the relevance of reducing energy consumption is considered. An assumption is made that in cases where indoor illuminated switches are used that control a group of lamps, currents of the order of microamperes flow in the lighting network in the switched-off mode.The regulatory documentation related to the normative indicators of illumination as well as the typical area of premises is analyzed, and on the basis of the listed data, the calculation of the minimum required luminous flux emitted by lamps is made. The normalized calculated luminous flux was divided by the luminous flux from one lamp, with the resulting ratio rounded up. This ratio is the approximate number of lamps. This number of lamps will enable to calculate the total current of the entire lighting network.The standard rates for the operating time of the lighting network are taken into account. The operating time of the lighting network in the "standby" mode is the difference between the total number of hours per day and the standard operating time of the lighting network.Knowing the power consumption and the network operation time in the "standby" mode, we can calculate the power consumption of the lighting network in the "standby" mode.

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49

Nakano, Kenji, Shiro Iida, Kenji Itaya, and Masaru Saito. "Discharge tube for high luminous flux self-ballasted fluorescent lamp." JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN 80, Appendix (1996): 72. http://dx.doi.org/10.2150/jieij1980.80.appendix_72.

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50

Nakazawa, Yuri, Kenji Godo, and Tatsuya Zama. "Investigation of Calculation Method for Total Luminous Flux with Goniophotometry." JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN 100, no. 2 (2016): 67–73. http://dx.doi.org/10.2150/jieij.100.67.

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