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Abstract
Luminous efficacy of LED sources are theoretically estimated by considering ideal and typical spectral responsivity values of the measuring photometer and radiometer. The luminous efficacies of red emitting and yellow emitting LED lamps are then measured. A good agreement between the theoretical and measured values are observed and the possible reasons for the variation in measured values are highlighted.
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B Chakraborty
Biswajit Chakraborty, received MSc (Tech) in Applied Physics with specialisation in Optics & Optoelectronics and PhD (Tech) from the Department of Applied Physics, Calcutta University in 1983 and 1989 respectively. Worked as a Scientist' in Central Scientific Instrument Organisation (A CSIR Laboratory), Chandigarh, in 1988–89 and as a Senior Scientist in the Department of Electronics (Govt of India) sponsored project in the Department of Applied Physics, Calcutta University during 1990. Currently working as Manager in the R&D Division of MECON Limited (A Govt of India Enterprise), Ranchi. Published and presented a number of papers in National and International journals and symposiums. Reprint included in the Mile Stone Series published by SPIE (USA). Designed, developed, patented and commercialized Optical systems for industrial use. Member of IEEE (USA), SPIE (USA) and Life Member of the Optical Society of India and Computer Society of India.