Junction temperature affects photometric and electrical performance of LED devices. In this paper, junction temperature effect on electrical power is investigated. The theoretical results and measurement results indicate the consumed electrical power of an LED device not only relates to injection current, but also depends on junction temperature. A mathematic model of electrical power of LED devices, considering the combined effect of junction temperature and injection current, is proposed. The proposed electrical power model has been verified with experimental measurements. It is helpful for LED performance evaluation.
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