How to driving 40 3V white LEDs in series

Not open for further replies.

Thread Starter


Joined Feb 13, 2012
Ok recently I got this cheap white led lamp with magnify glass, all good but when I open it and have a look, the leds are driven directly from 240v main with a resistor, and a bridge rectifier.

It doesn't look safe, so I'm thinking maybe power it from a 12vdc with a booster converter.

So should I leave it as it is, or make a boost converter and power it with 12v, is it practical? If not, what are the other options?

My goal is make it safer to use. (And I want the LEDs last for a reasonal amount of time).

The LEDs draw about 8mA, 40 in series, and I really don't want to resolder them in parallel :p
Not open for further replies.