Hi all, I am looking at driving six to eight LEDs in series. I have one power supply at 30VDC Pulse Width Modulated. I want to create a constant current supply of up to 100mA to drive the LEDs. I have looked at a number of IC's that can drive the LED's and also use a PWM for dimming, but these use a constant DC supply to drive them. I expect the +28V to be used for the dimming. Any ideas? Regards Bedfordwheelnuts.