My new Cespitularia PIcs

Why does everyone talk about how many W bulbs and what spectrum to leave it under, but never mention how deep it is in the tank. Do you all know how deep each others tanks are? If this thing was only 1" under the waters surface wouldn't that be over kill and start to inhibit growth?
Just curious, I picked up a peice of it recently and just find it wierd the way people talk about what lights to put it under.
 
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