[sudo-discuss] Dimmable 100W LED Driver Design for Arduino

I'm trying to drive several devices: 1) 1x 1w 12v fan (pentium 2 cpu cooler) 2) 1x 100w 35v 3a smd led. (I want the led to be dimmable & ideally capable of high frequency switching :)) - *Forward Voltage (VF): DC 32-34V* - *Forward current (IF): 3000MA* - *Out put Lumens: 8000-9500LM* 3) several other servo/stepper motors for pan/tilt type uses with one arduino uno. Obviously, the arduino will not power the led so I need a driver for it & maybe even the motors. My research leads me to think that the led wants a constant current of 3 amps & a variable voltage for dimming. Circuits of this caliber have not been forthcoming in my searches on the web. Thank you for your consideration. Cheers Robb