Results 171 to 180 of about 84,646 (208)

The Development of LED Marker Lamp

SAE Technical Paper Series, 2003
<div class="htmlview paragraph">LEDs have been applied to automotive exterior lighting more and more. Compared with incandescent lamps, LED light directivity is variable by changing epoxy resin lens form. This characteristic has enabled us to develop a new system in which oval light distribution pattern is formed by combining direct beams from ...
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Compact Lamp Using High-Brightness LEDs

2008 IEEE Industry Applications Society Annual Meeting, 2008
This paper proposes a circuit for a compact lamp based on high-brightness LEDs. It aims energy savings, high luminous efficacy and high useful life when substituting incandescent or compact fluorescent bulbs for LEDs without any change in the electric system installation.
Rafael A. Pinto, Marcelo R. Cosetin, Tiago B. Marchesan, Murilo Cervi, Alexandre Campos 0002, Ricardo N. do Prado   +5 more
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Wireless network node of LED street lamps

2015 IEEE International Conference on Electro/Information Technology (EIT), 2015
A wireless communication of LED (light emitting diode) street lamps is studied based on ZigBee protocol working with 2.4GHz. The experiment is done between two nodes of wireless LED street lamps, and the result shows that PER is blow 1% when their distance is less than 43m which satisfies the requirement of wireless network of LED street lamps.
Deng Huaqiu, Xiao Li, Xue Huaqiang
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The Effects of Applying LED Lamps

NCSL International Workshop & Symposium Conference Proceedings 2015, 2015
The objective of this work is to evaluate the harmonic distortion in the current waveform of Lighting Emitting Diode Lamps (LED). For that, power factor, voltage waveform, current waveform, total harmonic distortion (THD) and active power are analyzed.
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Retrofit LED lamps: Photometric flicker analysis

2015 IEEE Industry Applications Society Annual Meeting, 2015
The paper exposes the topic of LED lamps photometric flicker. Aim of the paper is to evaluate the flicker of contemporary devices. A sample of commercially available LED retrofit lamps is analysed in terms of the photometric flicker under ideal sinusoidal power supply conditions.
Kukačka, Leoš, Dupuis, Pascal, Zissis, Georges, Kolar, Milan   +3 more
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Compact Emergency Lamp Using Power LEDs

IEEE Transactions on Industrial Electronics, 2012
This paper presents a compact emergency lamp using light-emitting diodes (LEDs). The goal is to develop a compact and low-cost electronic circuit to drive and control the current of LEDs arranged in a single enclosure. The main advantage of the proposed idea is to use the same equipment in the daily activities, supplied by the ac line, and under a ...
Rafael A. Pinto, Marcelo R. Cosetin, Alexandre Campos 0002, Marco A. Dalla Costa, Ricardo N. do Prado   +4 more
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LED Lamp with a Compact Emergency Lighting System

2009 IEEE Industry Applications Society Annual Meeting, 2009
This paper presents an efficient and compact emergency lighting system using high intensity light emitting diodes (LEDs). The proposal aims energy saving, high luminous efficacy and high useful life when replacing traditional emergency lighting systems and incandescent or compact fluorescent lamps by LEDs without any change in electrical system ...
Rafael A. Pinto, Marcelo R. Cosetin, Marcelo Freitas da Silva, Gustavo Weber Denardin, Alexandre Campos 0002, Ricardo N. do Prado   +5 more
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Failure causes and mechanisms of retrofit LED lamps

Microelectronics Reliability, 2015
Abstract This paper describes one of the first studies of the degradation of retrofit light bulbs based on white GaN light emitting diodes. The results indicate that the lifetime of LED lamps depends mostly on the stability of the driver and optical elements, rather than on the degradation of the LED chips, that have a stable output over stress time.
DE SANTI, CARLO, DAL LAGO, MATTEO, BUFFOLO, MATTEO, MONTI, DESIREE, MENEGHINI, MATTEO, MENEGHESSO, GAUDENZIO, ZANONI, ENRICO   +6 more
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Controller of led lamp

A controller (116) of an LED illuminating lamp (110) is provided. The controller is configured to replace a starter of a gas discharge tube and it comprises a processing unit (204), pins (200, 202) contactable with counterparts of a starter socket, a power harvesting arrangement (206, 208) operationally coupled between the pins, and a switch (210 ...
Jurvansuu, Marko, Hyypiö, Risto, Sarjanoja, Esa-Matti, Jokelainen, Kimmo, Rautava, Jukka, Heikkinen, Tero, Eskeli, Juho   +6 more
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LED PHOTOMETRIC MEASUREMENT BASED ON LED STANDARD LAMPS

CIE x051:2025 Proceedings of the CIE 2025 Midterm Meeting Vienna, Austria, July 4-11, 2025: Scientific Conference (July 7-9, 2025)
The study of LED photometric measurement, which utilizes LED standard lamps as a complement to traditional incandescent standard lamps, has been undertaken. As a means to transition the photometric scale, LED transfer standards are crucial for LED photometry.
Weiqiang Zhao, Jinyun Yan, Chao Tang, Hui Liu, Ying Su   +4 more
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