2011•Advanced materials researchOpen access

Effect of Temperature and Current on Luminous Efficiency of High Power LED

Feng Rao, Zhi Chen Ge, Jin Lian Zhu

Abstract

Luminous efficiency of high power white light LED (light emitting diode) at different temperature and driver current is measured with the photometric, chromatic and electric characteristics analyzer. It is shown that the luminous efficiency decreases as the temperature and (or) the driver current increases. The highter the driver current is, the more strongly temperature worsens the efficiency. However, the changing rate of efficiency with current is similar at different temperature. At last, a luminous efficiency model with temperature and current is constructed. This research is very important for the design of energy-saving LED lamps.

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Available abstract

Key concepts: Luminous efficacy, Current (fluid), Luminous flux, Luminous intensity, Materials science, Color temperature, Light-emitting diode, LED lamp