Is a driver circuit really necessary for power LEDs? Answered
I have heard that a constant current source or something like that is required to drive power LEDs such as the Luxeon. I want to power several Luxeon Rebels, and I have a 3.7v single cell 900mAh Li-Ion battery. The description I read for the Luxeon Rebel (cool white color) states that it can have a forward voltage anywhere from 3 to 4 volts. Can't I just connect it to the battery then? Or does it have to do with current?