If DIY projects don't put you off check out RapidLED.com. For tight space requirements I'd use their 1.4" wide heatsink (drilled and tapped). I recommend independent dimmer channels on all channels (colors).
FWIW, green is barely used in photosynthesis, red doesn't do much either and encourages nuisance algae growth, U/V light doesn't penetrate very deep at all in water, it's pretty much the first color to get filtered out despite it's wavelength. The SPS corals found in inter-tidal areas that are directly exposed to the sun form a mucous slime to protect themselves from the suns harmful UV radiation.
So add these colors with care - there's a reason these spectrums haven't been emphasized in the flourescent and MH aquarium bulbs.