Help LED Flood lamp power supply reduce flicker and current

Thread Starter


Joined Jul 23, 2008
Hello, I have bought 20W LED Flood lamp, only to discover it flickers bad, 37%.
I did not test before buying, however I rushed to store to exchange it to anything better.
I discovered that other light flickered 100-150%.

So here is the PCB shot both sides.
The driver chip is BP3319MB

Original cap is 120V 120uF flicker 37% voltage 86V 30LEDS 188mA current
I added 2x 470uF (total 1060uF) flicker 8.5% voltage 86V 30LEDS 188mA current
I added 1x 390uF (total 1450uF) flicker 5.2% voltage 86V 30LEDS 188mA current

I expected single cap like 470uF would solve the problem, why I need so many caps?
Looking for any help.

Also how to adjust current, the datasheet is not clear about that, see PCB photos any hints?

You can copy image link and open better resolution images.



Joined Nov 6, 2012
Most people don't measure the Power-Supply-Noise of an LED Lamp.

Why do You care ?

If You actually need close to zero-Noise, then the Color-Spectrum must also be important.
If either of these is the case,
You will have to build your own Custom-Power-Supply, powering specifically selected COB-LEDs.