I found a company that sells high powered LED modules (www.leds.de). I ordered 3 SEOUL P5 RGB LED that already was mounted on a PCB. For controlling the LEDs I choose a PIC16F628A and 3 TLE4242G constant current sources. After that I found a remote controlling kit laying around in a box, so I added it to the project. By controlling the current sources with a uP and PWM, I now can blend the lamp to almost any color I want. And it use much less power now and generates almost no heat.
This project was not supposed to be on Instructables.com from the beginning so there is a lack of photos in the instructable.
Step 1: What you need
3 Seoul P5 RGB on PCB
some SMD resistors and capacitors
a PCB designed by my self and produced with your favorite method
a sheet of copper, 1mm thick
RXF-4303D and TXF-4311R remote control kit ( I had on laying in my box of spare parts :) )
Power supply 12V 1A
PIC programmer ( PICkit 2 )