There have been multiple articles that state UV does very little.
http://www.advancedaquarist.com/2007/2/aafeature#h2
http://www.reefs.org/library/aquariu...98/1298_2.html
Quote:
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Some hobbyists may be surprised that we did not include ultraviolet radiation (UV) as a factor. We have measured UV energy in dozens of aquaria and have reached the conclusion that high doses of UV energy do not play a role in making corals turn purple, red, blue, etc. We have noted that green fluorescent pigments may be produced under conditions of higher UV energy (about 30 microwatts per square centimeter per second).
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Dana Riddle
MCsaxmaster isn't pulling this out of his hat, this is common knowledge in the hobby. Of course common knowledge isn't alway correct.