I like two articles he wrote that mention UV in relation to coral growth:
"Our experiences suggest that coral coloration is a response to PAR levels, not UV. In short, we find no reason to subject reef aquaria to high UV levels." (http://www.aquarium-design.com/reef/uvlighting.html)
and
"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)." (http://www.reefs.org/library/aquarium_net/1298/1298_2.html)
"Our experiences suggest that coral coloration is a response to PAR levels, not UV. In short, we find no reason to subject reef aquaria to high UV levels." (http://www.aquarium-design.com/reef/uvlighting.html)
and
"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)." (http://www.reefs.org/library/aquarium_net/1298/1298_2.html)