Thermal characteristic of led in different degree of ambient temperature / Nur Syafiqah Ikhwani Ahmad Sarbri

In general, there is only 15-20% of the power transformation of LED to illumination, whereas 80-85% dissipates heat. Therefore, with the implement of high brightness LEDs, the requirement for driving current increased and thus increasing heat dissipation. This is a study on the relationship between the thermal of LED with the temperature of surroundings. The aims of this study are to understand the role of thermal design in lighting system, to study the characteristics of thermal lighting system, construct the model for characterize it and analyze the effect of thermal LED in different degree of ambient temperature. Data were obtained via experimental setup during laboratory. The experiment was setup with connected the sensor to detect the amount of heat dissipated by the LED to the Arduino software. The experiment was doing for 3 days to take the different ambient temperature. Data was obtained through the software for every 10 minutes during 24 hours time taken. As a results, the thermal of LED changes with the changes in temperature of surroundings. The thermal LED higher during the hot time that is in the afternoon and reduces when achieves night time. In conclude that, the increase in ambient temperature will give an effect to the LEDs and result in higher junction temperature of LED. The higher temperatures can significantly decrease the light output of LEDs over time and also can reduce its lifetime.