It is reported that LED floodlights have greater luminous power than household lamps, so LED floodlight manufacturers have made great efforts in the design of heat dissipation substrate fins and heat dissipation modules. After assembling LED floodlights, baking varnish should be added to the outside of the heat dissipation modules of lamps to prevent climate erosion. Otherwise, the paint for external protection seals the heat of the heat dissipation module back, resulting in poor heat dissipation and light failure of the LED light source.

LED flood light industry experts to analyze the causes of light decay:

1. The luminous heat energy of LED projection lamp belongs to a small range of concentrated heat energy. In the application of high-power projection lamp, the power input power is also large, and the interface temperature of LED is quite high. Under the long-term continuous operation of projection lamp, if the heat dissipation module cannot effectively dissipate heat, the service life and luminous performance of LED will be affected. For example, the serious light failure of current LED projection lamp is caused by these factors.

2, LED floodlight is used outdoors, there are environmental climate interference factors, so most manufacturers are LED floodlight radiator shell with anode treatment protection, or add paint, in order to avoid the erosion of acid and alkali substances. The life of anodizing is not long, and it will still be oxidized and discolored over time. If heavy work is to be removed, it will not only take time and labor but also increase the maintenance cost. The baking varnish has low protection cost and good protection effect. However, the baking varnish generally has no heat dissipation function, and the paint body itself will form a blocking effect, which is equivalent to increasing the thermal impedance of the LED projection lamp radiator. Instead, it is not helpful, let the LED luminous power is reduced, and finally lead to serious light failure.

3. For example, when the light-emitting component is bonded to the aluminum substrate, the thermal conductive adhesive plays a key role. Some manufacturers think that the thermal conductivity of the thermal conductive adhesive film or the thermal conductive adhesive pad is better, and the thicker the film thickness, the better, but they do not think about the thermal resistance problem. No matter how good the thermal conductivity is, it is useless to encounter the thermal resistance of the film thickness. What's more, the thermal conductive adhesive film or soft thermal gasket can not really be closely connected with the substrate, and there are many pores on the bonding surface. These pores, when viewed under an electron microscope, look like empty pockets of air, another form of thermal resistance. In the presence of so many thermal resistances that interfere with heat conduction, the efficiency of heat dissipation and heat conduction is virtually reduced.

The above points have been a serious problem in the LED lighting industry, which is almost the main reason why the current public works LED flood light can not pass the acceptance of the purchasing unit. Therefore, in order to solve the problem of light failure of LED flood lights, experts suggest that flood light manufacturers start from the basic materials and fundamentally solve the problem of high-power LED heat sources from the inside out.