Results 21 to 30 of about 109,078 (298)

Light-Emitting Diodes (LEDS): Implications for Safety

Health Physics, 2020
Abstract Since the original ICNIRP Statement was published in 2000, there have been significant improvements in the efficiency and radiance (i.e., optical radiation emission) of LEDs. The most important improvement is the development of ‘white’ LEDs that can be used as general lighting sources, which are more efficient than traditional ...
Ziegelberger G., Miller S. A., O'Hagan J., Okuno T., Schulmeister K., Sliney D., Stuck B., Croft R., Feychting M., Green A. C., Hirata A., D'Inzeo G., Marino C., Oftedal G., van Rongen E., Roosli M., Sienkiewicz Z., Watanabe S.   +17 more
openaire   +6 more sources

A Single-Stage LED Tube Lamp Driver with Power-Factor Corrections and Soft Switching for Energy-Saving Indoor Lighting Applications

Applied Sciences, 2017
This paper presents a single-stage alternating current (AC)/direct current (DC) light-emitting diode (LED) tube lamp driver for energy-saving indoor lighting applications; this driver features power-factor corrections and soft switching, and also ...
Chun-An Cheng, En-Chih Chang, Ching-Hsien Tseng, Tsung-Yuan Chung   +3 more
doaj   +1 more source

Light emitting diode (LED) use in artificial lighting for broiler chicken production [PDF]

Engenharia Agrícola, 2014
Light emitting diode (LED) has been used in commercial poultry industry by presenting superior energy savings and providing feasibility on production process.
Mayara R. de Santana, Rodrigo G. Garcia, Irenilza de A. Naas, Ibiara C. de L. A. Paz, Fabiana R. Caldara, Bruna Barreto   +5 more
doaj   +2 more sources

Preparation of N-doped carbon dots based on starch and their application in white LED [PDF]

, 2018
N-doped carbon dots (CDs) were synthesized simply and economically by a one-step hydrothermal method using starch as a carbon source and ethylenediamine (EDA) as a nitrogen dopant.
Chen, Yong, Liu, Xinghua, Liu, Xuguang, Yang, Yongzhen, Zheng, Jingxia   +4 more
core   +2 more sources

Energy efficiency assessment of power electronic drivers and LED lamps in Li-Fi communication systems

Energy Reports, 2021
Light-fidelity (Li-Fi) communication systems have gained increased concerns as new and alternative paradigm for wireless communications. Through the increased applications of light emitting diode (LED) lamps for lighting in indoor and outdoor ...
Anwaar M. Damerdash, Doaa Abdelhameed, Mokhtar Aly, Emad M. Ahmed, Mohamed A. Ahmed   +4 more
doaj   +1 more source

Light emitting diodes (LEDs) applied to microalgal production [PDF]

Trends in Biotechnology, 2014
Light-emitting diodes (LEDs) will become one of the world's most important light sources and their integration in microalgal production systems (photobioreactors) needs to be considered. LEDs can improve the quality and quantity of microalgal biomass when applied during specific growth phases.
Schulze, Peter S.C., Barreira, Luísa A., Pereira, Hugo G.C., Perales Vargas-Machuca, José Antonio, Varela, Joao C.S.   +4 more
openaire   +2 more sources

Doping concentration effect on performance of single QW double-heterostructure InGaN/AlGaN light emitting diode

EPJ Web of Conferences, 2017
Light emitting diode (LED) employed a numerous applications such as displaying information, communication, sensing, illumination and lighting. In this paper, InGaN/AlGaN based on one quantum well (1QW) light emitting diode (LED) is modeled and studied ...
Abdul Halim N. Syafira, Wahid M.Halim A., Ahmad Hambali N. Azura M., Rashid Shanise, Shahimin Mukhzeer M.   +4 more
doaj   +1 more source

LEDs: Sources and Intrinsically Bandwidth-Limited Detectors

Sensors, 2017
The increasing demand for light emitting diodes (LEDs) is driven by a number of application categories, including display backlighting, communications, signage, and general illumination.
Roberto Filippo, Emanuele Taralli, Mauro Rajteri   +2 more
doaj   +1 more source

4.343-Gbit/s Green Semipolar (20-21) μ-LED for High Speed Visible Light Communication

IEEE Photonics Journal, 2021
A record 4.343 Gbit/s green color micro-light-emitting-diode (μ-LED) based visible-light-communication (VLC) is demonstrated. We designed and fabricated the InGaN/GaN μ-LED array with modulation bandwidth >1.1 GHz.
Yun-Han Chang, Yu-Ming Huang, Wahyu Hendra Gunawan, G.-H. Chang, F.-J. Liou, C.-W. Chow, Hao-Chung Kuo, Yang Liu, Chien-Hung Yeh   +8 more
doaj   +1 more source

Analysis of the microtensile bond strength to enamel of two adhesive systems polymerized by halogen light or LED Análise da microtração em esmalte de dois sistemas adesivos ativados por LED ou por luz halógena

Brazilian Oral Research, 2005
With the development of composite resin polymerization techniques, LEDs were introduced to the market place. Based on the studied literature, the aim of this study was to evaluate, through microtensile testing, the bond strength to enamel of a composite ...
Ana Paula Morales Cobra Carvalho, Míriam Lacalle Turbino   +1 more
doaj   +1 more source