Q: For same power, why different suppliers with different brightness?
A: Different chips, or same chip but different brightness version. The brightness will be different. But for same chip and same brightness version, the brightness will be slight difference. But please make clear the brightness difference between LEDs and lamp fixture.
Q: What is PF and efficiency?
A: PF and efficiency is to feedback the driver electrical performance. Higher PF and efficiency with higher cost.
Q: How about the luminous attenuation?
A: The luminous attenuation is about 0.2%-0.3%.
Q:What if the driver or the chip is out of work?
A: We will sent you the new item or part accordingly. Usually the replace item will go with the next order. Otherwise you will pay the freight cost.