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Aloha Hahnmeister,
The Germans (and many other researchers for that matter) are correct in that blue light is largely responsible for photoinhibition.
Blue light can trigger dynamic photoinhibition, which is part of the zoox's protection from excessive light. Dynamic Photoinhibition is quite normal, and part of the natural diurnal photoprotective cycles.
Now. Are lamps skewed towards the blue end of the spectrum bad for corals? The answer is 'yes' and 'no' - it depends upon the quantity or intensity of blue light. At sub-saturating intensities, blue is OK, and perfectly normal. When blue intensity is ramped upwards, the natural dynamic photoinhibition comes into play.
Dana
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