Info Manual

Driving High Power Leds

High power leds from 1 watt up to 5o watts of power needs a constant current driver in order to gain a respectful efficiency, than just using those big bulky white coated limiting resistors, that not just only robs the total power of your leds, but produces poor efficiency that kills the potential of your LEDS.

A 1 watt high power leds in my opinion needs at least a 350mah constant current driver to produce its total luminance, whereas a 3 watts needs 700mah, a 5 watts needs a 1A driving current and so on and so forth.


In the picture above, is a 3 watts X 3 watts high power leds made by SEOUL semicon model P4 i ordered online. It been driven at a selectable switch in a 350mah and 700mah constant current configuration, using a switching mode type circuit. Commonly known circuit that can be used are, NCP3063 by ON semiconductor
LM3404 by national , the cheaper MC34063 by motorola...etc etc.

sample circuit as shown here: