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General Photo-Electro-Thermal Theory for LED Systems

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Lighing systems consume about 20% of global electrical power. This seminar begins with a brief introduction of lighting technology and the current limitations of LED technology. Then a general theory linking the interactions of photometric, electrical and thermal aspects of LED systems will be introduced. This theory can be used to explain why LEDs may not always give the highest luminous output at their rated power. It also points to the optimal LED device structures and LED systems designs. An optimal LED system design approach will be described. The theory is supported by practical measurements based on LED devices from different maunufacturers. The remaining hurdles for LED technology to enter the general lighting markets will be addressed and new solutions suggested.

BIOGRAPHY : Ron Hui obtained his Ph.D at Imperial College in 1987. He was a lecturer at the University of Nottingham in 1987-1990. He went to Australia and was promoted to Reader at the University of Sydney in 1995. In 1996, he was appointed Chair Professor of Electronic Engineering at the City University of Hong Kong. Elected as a Fellow of IET in 1997 and Fellow of the IEEE in 2002, he has published over 130 IEEE /IET journal papers in Power Electronics. Over 45 of his patents have been adopted by industry. Among them, the wireless battery charging platform technology has just been adopted by an international consortium for setting a new international standard for charging portable electronic devices. He has been elected as a Distinguished Lecturer by the IEEE PELS twice (2004-05, 2006-07) and is an Associate Editor for the IEEE Transactions on Power Electronics and Transactions on Industrial Electronics.

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