Because the luminous flux of LEDs depends on many factors, including drive current and junction temperature. To accurately calculate the number of LEDs required, the efficiency of the optical, thermal and electrical systems must first be estimated. The relative luminous flux output of LEDs will decrease as the junction temperature rises, and most LED data sheets list typical luminous flux values below 25°C, while most LED applications in enclosed applications will have higher junction temperatures. Therefore, when the junction temperature Tj > 25°C, the luminous flux will definitely be worse than the value given in the LED data sheet.
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