This RGB light I designed and built a while ago. A large spectrum of coloured light can be made mixing light from bulbs coloured in red, green and blue.
So, this one is not based on LEDs but it’s based on 3×60W 220/110Vac light bulbs.
Also, it has a remote controller to change intensity of the three bulbs, store and recall
preferred hues, turn the thing on and off.