Originally Posted by natureboy
i'm not 100% sure about this but i have heard that the white moonlights provide a more realistic moonlight (good for spawning etc...) and the blue lights are simply for looks.
Well actually The blue light from the LED closly resembles moon light. My moons are 470nm, which is the closest you can get to natural moon light.
If you go with white you need to make sure you don't use to many because you will just be adding to the growth of algea.
Blue is the best for moons IMO, plus it gives a more appealing look to the tank at night.