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Ge, A.; Du, Z.; Wang, W.; Qiu, P.; Wang, J.; Cai, J.; Song, X. |
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Title |
A composite optical system for a LED based headlamp low beam module |
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Journal Article |
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Year |
2013 |
Publication |
Lighting Research and Technology |
Abbreviated Journal |
Lighting Research and Technology |
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45 |
Issue |
6 |
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752-757 |
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Keywords |
Lighting |
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In this paper, we propose a composite optical system for automotive headlamps. The system is composed of a paraboloid collimating reflector, an off-axis paraboloid reflector, a baffle and an imaging len. By using a LED as the light source, precise light distribution can be achieved. When making ray-tracing simulation for the composite optical system in TracePro, a clear cut-off line can be seen on the measuring screen, as well as a hotspot at the centre. The power consumption for the LED light sources in this system is less than 10 W, resulting in an energy efficiency of more than 58% and a maximum illumination of 26.76 lux at the centre hotspot. |
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1477-1535 |
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LoNNe @ kagoburian @ |
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632 |
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Fressoz, J.-B. |
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Title |
The Gas Lighting Controversy: Technological Risk, Expertise, and Regulation in Nineteenth-Century Paris and London |
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Journal Article |
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2007 |
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Journal of Urban History |
Abbreviated Journal |
Journal of Urban History |
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33 |
Issue |
5 |
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729-755 |
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Lighting; Regulations |
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0096-1442 |
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LoNNe @ kagoburian @ |
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1037 |
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Gil-de-Castro, A.; Moreno-Munoz, A.; Larsson, A.; de la Rosa, J.; Bollen, M. |
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Title |
LED street lighting: A power quality comparison among street light technologies |
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Journal Article |
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Year |
2013 |
Publication |
Lighting Research and Technology |
Abbreviated Journal |
Lighting Research and Technology |
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45 |
Issue |
6 |
Pages |
710-728 |
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LED; LED lighting; high-pressure sodium; HPS; outdoor lighting; lighting technology |
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High-pressure sodium lamps are currently the main lamps used in public lighting. However, the possibility of using high-power light emitting diode (LEDs) for street lighting is growing continuously due to their greater energy efficiency, robustness, long life and light control. The aim of this paper is to study the power quality of high-power lighting networks based on LED and high-pressure sodium lamps. Both electromagnetic and dimmable electronic ballasts, which can dim the lamp output smoothly and uniformly, have been used connected to high-pressure sodium lamps. High-pressure sodium lamps connected to electronic equipment have been tested with different arc power levels using dimming on a 230 V power supply. The study presented in this paper is completely based on measurements, including harmonic currents in the frequency range up to 150 kHz for all the technologies. The main results show a broadband spectrum in LED lamps which confirms other research in fluorescent lamps powered by high-frequency ballasts. Results also indicate a decrease in the harmonic value with increasing harmonic order, and a decrease in the harmonic value at half load (60%) compared with full load (100%). Although total harmonic distortion of the current is lower with high-pressure sodium lamps connected to electronic rather than electromagnetic ballasts, LED lamps achieved the lowest total harmonic distortion of current. |
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Department of Computer Architecture, Electronics and Electronic Technology, University of Cordoba, Cordoba, Spain |
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IDA @ john @ |
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333 |
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Kantermann, T. |
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Title |
Circadian biology: sleep-styles shaped by light-styles |
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2013 |
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Current Biology : CB |
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Curr Biol |
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23 |
Issue |
16 |
Pages |
R689-90 |
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Keywords |
Human Health; Circadian Clocks/*radiation effects; Female; Humans; *Lighting; Male; *Photoperiod; *Sunlight |
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Light and darkness are the main time cues synchronising all biological clocks to the external environment. This little understood evolutionary phenomenon is called circadian entrainment. A new study illuminates our understanding of how modern light- and lifestyles compromise circadian entrainment and impact our biological clocks. |
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Chronobiology – Centre for Behaviour and Neurosciences, University of Groningen, Nijenborgh 7, 9747 AG Groningen, The Netherlands. thomas@kantermann.de |
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0960-9822 |
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PMID:23968925 |
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LoNNe @ christopher.kyba @ |
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501 |
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John D. Bullough |
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Title |
Opinion: Will road lighting wither? |
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2017 |
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Lighting Research & Technology |
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49 |
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672 |
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Commentary; Lighting |
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LoNNe @ kyba @ |
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1761 |
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