For estimating the junction temperature (Tj) of LED lamp, the Tj of LED module powering by rated current (135mA DC) and working in the thermal environment of LED lamp is measured with traditional forward voltage method in experiment 1. To calculate the Tj of LED lamp in actual working conditions (220V AC), a correction factor is introduced into the original model to process the deviation of output currents of LED driver electronics, as demonstrated in experiment 2. Compared with the surface temperature of LED obtained by infrared imaging method, the result in experiment 2 can effectively reflect the change in Tj of LED lamp under different ambient temperatures, which differs the surface temperature by 3???4??C. While due to a significant effect on the thermal environment of LED lamp introduced by LED driver electronics, the result in experiment 1 is approximately 9???10??C lower than that in experiment 2.
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机译：为了估计LED灯的结温（TJ），LED模块的TJ通过额定电流（135mA DC）供电并在LED灯的热环境中使用实验1.计算TJ LED灯在实际工作条件（220V AC）中，将校正因子引入原模型，以处理LED驱动器电子产品的输出电流的偏差，如实验2所示。与通过红外成像方法获得的LED的表面温度相比，实验2中的结果可以在不同的环境温度下有效地反映LED灯TJ的变化，其与表面温度不同3 ??? 4。虽然由于LED驱动器电子引入的LED灯的热环境的显着影响，但实验1的结果比实验2低约9 ??? C.
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