Why Are LED Floodlights Afraid Of Getting Hot?

LED is essentially a semiconductor device (semiconductor is actually a very fragile device). As long as the temperature is slightly higher, its performance will decrease, its life span will be shortened, and it may even be damaged.

In the LED chip, there are various heat conduction media and the bottom radiator, so that the heat emitted by the LED can overflow the inside of the lamp body in time, so that the temperature of the LED itself is at a stable low temperature value.

Way of heat dissipation of lamps:

In physics, there are three basic ways of heat conduction, namely conduction, convection and radiation.

1. Conduction

The first is conduction. Conduction means that heat will run from the place where the temperature of the object is high along the heat conductor to the part with a lower temperature.

The factors that affect it are:

1. Thermal conductivity of heat sink material

2. Thermal resistance caused by heat dissipation structure

3. Shape and size of thermal conductive material

The above three points will affect the speed and efficiency of heat conduction.

2. Radiation

Radiation is a phenomenon in which high-temperature objects directly radiate heat outward. Its efficiency depends on the thermal resistance of the surrounding medium and the characteristics of the heat radiating material itself.

3. Convection

Convection is the use of gas or liquid flow to take away the heat generated.

How to judge the heat dissipation performance

After analyzing the way the lamp emits heat, when we get a lamp, how do we judge whether its heat dissipation is good or not?

Of course, the easiest and fastest way is to use professional equipment to measure the temperature, and there is another method-called the half-hour illumination method. Generally speaking, when the junction temperature of the LED (the temperature of the PN junction inside the LED chip is referred to as the junction temperature) increases, the luminous flux will decrease. Then, we only need to indirectly measure the illuminance change of the lamp at the same position, and then we can infer the change of junction temperature (just need an illuminance meter to be OK).