Yes there is such a thing as "too much light." It is species dependent however. Photoinhibition is possible and varies dependent on the species of coral/zooxanthellae being investigated - essentially blasting corals with tons of light can be a waste of hydro. But excessive lighting can also produce some unique effects so "too much light" is a relative term depending upon your goals (growth, fluorescence, etc.)
Read here:
http://www.advancedaquarist.com/2007/3/aafeature1
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