The ambient temperature in LED luminaires is because in many luminaires, LEDs and electrolytic capacitors are placed in the same enclosure. Simply put, the ambient temperature is the same. This ambient temperature is mainly determined by the balance of heat and heat dissipation between the LED and the power supply. And the heat and heat dissipation of each LED luminaire is different, so how can we know the ambient temperature?
What is the ambient temperature in the LED luminaire? In fact, this problem can be reversed, that is, a well-designed LED luminaire, which allows the internal ambient temperature to be constant. This is because the junction temperature of the LED chip is the main reason for determining the light decay (life) of the LED chip. The LED junction temperature is of course related to its ambient temperature, so as long as the allowed LED junction temperature is known, it can be inferred from the inside of the LED fixture. Ambient temperature. However, there are at least three thermal resistances, that is, the thermal resistance θjc of the LED chip to the outer casing, and the thermal resistance of the LED casing to the surface of the aluminum substrate. In fact, it passes through the solder, the copper foil, and the insulating layer to the aluminum plate, but among them The most important is the thermal resistance of the insulating layer, collectively referred to as θlv, and the third is the thermal resistance θla of the air from the aluminum plate to the blister.
Take the 3014 LED, its thermal resistance θjc is 90 ° C / W, because its power is only 0.1W, so the internal and external temperature difference is 9 ° C. The thermal resistance of the aluminum substrate is 1 °C / W. For a 10W lamp, since all 10W LEDs are mounted on the same aluminum substrate, the total temperature difference is 10 ° C, a total temperature difference of 19 ° C, the last Θla is difficult to estimate because it is related to the circulation of air. In the case where the internal air does not flow, the temperature difference is only about 1 °C, so the total is 20 °C. That is, the LED junction temperature is equal to the ambient temperature plus 20 °C.
So can the ambient temperature inside the bulb allow 105 degrees? Just look at the picture below and you will know. That is the relationship between Cree's LED chip junction temperature and light decay.
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