There are many manufacturers and brands, and the quality of LED downlights is uneven. Domestic LED downlight brands such as PHILIPS, Yinfu Optoelectronics, NVC, OP and other brands of LED downlights are very good. by Changfang, Zhouming, Panasonic, Osram, Foshan Lighting, Sanxiong Aurora and so on. International brands include matin, erco, infor, etc. But I don’t know which lamps are of good quality.

1. The level of PFC (power factor)
But not necessarily high PFC led driver is good, but the overall ramp wave is small, ripple is small, and interference is low (because some manufacturers deliberately make PFC very high but ignore the electromagnetic compatibility part).

2. Conversion efficiency
The conversion efficiency, the magnitude and stability of the deviation value, make an analogy: AC170-250V is the working voltage range, I can try to debug from 170V-250V led power supply, the constantly changing voltage from low to high can be seen on the power meter Whether the "conversion efficiency, PFC" fluctuates greatly to prove its stability.

3. Check whether the temperature rise of the power supply is high.
The higher the temperature of the power supply itself, the greater the damage to the components.

4. Periodic aging test
The aging of the lamp with continuous power supply can detect the attenuation of the lamp beads and whether the heat dissipation of the lamp housing is good.

5. Detect the instantaneous impact current to the lamp beads when starting up.

6. Detect the stability of constant current current.

7. check the protection function of the led power supply: whether it has over-temperature protection, over-voltage protection, over-current protection, short-circuit protection.

8.Hit high voltage: Whether the input to output can exceed 3000V withstand voltage. Whether the input can pass 1500V withstand voltage to the ground.