Just for the fun of it I made a very simple colour change/mood lamp.
It uses a single 10W RGB LED like this http://www.ebay.co.uk/itm/10W-Watt-RGB-Red-Green-Blue-HIGH-POWER-LED-Light-Lamp-DIY-UK-STOCK-/271028515764?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item3f1a8ef3b4
attached to a heatsink http://www.ebay.co.uk/itm/10W-LED-Aluminum-Heat-Sink-Heatsink-110x18mm-UK-Stock-/280935964629?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item4169169fd5
I built a triple constant current power supply to power the RGB LED and a ATtiny85. I bought a cheap lamp from Lidl and removed it’s wiring and lamp and replaced with the LED. It’s powered of a 12V wall wart. I may add a IR led in the future and make it remote control the colour & intensity.
Attached are a couple of pictures, the schematic & the sketch.
ATtiny-RGB Moodlamp.pdf (8.88 KB)
ATtiny_10W_LED_Moodlamp_v01.ino (3.46 KB)