Misunderstandings of LED lighting heat dissipation

In LED lamps , the heat dissipation is directly related to the quality and life of the product. However, due to the hype of some merchants and the misleading of so-called experts, some misunderstandings have emerged:

1. Superstitious belief in thermal conductive materials, because some high-tech materials can dissipate heat. In fact, using ordinary aluminum for heat dissipation, after many tests , the temperature of the heat sink is only 3-5 degrees Celsius higher than the bottom of the radiator. In other words, if a material with excellent thermal conductivity can be used, the temperature can be reduced by 3-5 degrees Celsius when the thermal resistance is zero.

2. Superstitious belief in heat pipes There is no doubt that heat pipes have good thermal conductivity. But the heat derived from the heat sink must eventually be taken away by air convection. If there are no heat dissipation fins, the heat pipe will quickly reach thermal equilibrium, and the temperature will rise together with the heat sink. If heat dissipation fins are added to the heat pipe, the fins will still be used to dissipate heat in the end. Moreover, the contact point between the fins and the heat pipe is not as good as other contact methods. The result is that the cost is high and the heat dissipation effect is not improved. However, heat pipes are still useful for heat conduction on integrated LEDs , but the structure must be reasonable!

3. Superstition of nano-radiation materials. The proportion of radiation heat dissipation can be ignored when the temperature of the lamp is about 50 degrees Celsius. Even if the radiation coating advertised by the manufacturer has a good radiation effect as they advertise, even if it reaches the radiation capacity of black body radiation, its heat dissipation proportion is only a few percent. What is the significance of this? Moreover, the coating itself will hinder the heat dissipation, thus affecting the convection heat dissipation.