i need some design on to drive luxeon led and control the brightness of it.it is better if the design is a swichmode type current source so i can vary the current and change the brightness of the led.
i really appreciate your help guys!
ultimately i find a simple ( not very much energy efficient method ) to control the brightness of a led using N mosfet (IRF540) and linear regulator. (lm317 as current source)
i have attached my sch to control brightness using a pic micro controller.