Here is a quote from a moonlight place:
The wavelength of the moon is NOT 470 nanometers (blue) as you may have read elsewhere. The moon reflects the light of the Sun, so it really contains all the colors (white to us). Blue is color the light should be at the depths of the reef. Water is very good at absorbing the higher end (red) of the visible light spectrum (550 nanometers and up). However, water is not as good at absorbing the lower end of the spectrum, where the blue light resides. So at these lower depths, only the blue end remains. This is the reason that blue LEDs, in the 470 nanometer range, are used in most moon lights.
We spend so much time trying to duplicate the ocean reefs I figure why not with the moonlights too.
Hope this helps
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Richard
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My wife believed me when I told her it was only going to cost about $500.00. that was over two years ago and I'm still grounded..... 
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