This is nice project from petesworld. Device is used to drive high power RGB led (250mA) by using PWM control. Controlling separate colors (Red, Green, Blue) there is possible to generate up to 16 million colours. Device is used mainly for dynamic and static color effects.
LED was placed in to diffused dome lamp. This way diffused light looks nice. Circuit diagram isn’t very complicated as there are ZXLD1350 current drive circuits used. Source code is available for non commercial use. Be sure to check for other project revisions.