How much lighting is too much?

[MitchM]

FWIW, you can provide your corals with too much light.

Read the section starting on pg 326 in Borneman's book Aquarium Corals, Selection, Husbandry and Natural History.

Pg 334 specifically mentions oxygen toxicity, caused by overlighting.

Also, I have the same lighting system that Wai's has, and I have seen corals in his tanks that were not doing so well either. Bleached, to be specific. I have bought some of those bleached corals and they have all come back to full color.
Remember that sometimes corals are in a dark box for extended periods of time during shipping. That can cause bleaching and other methods of coral death. (RTN, complications from sitting in their own waste and excretions)
Danny knows what he is doing when it comes to corals.

Mitch