Re: Light intensity and water depth

>From: Jayme Donnelly <Jayme_Donnelly%BOND__NOTES at notes_worldcom.com>
>Date: 16 Nov 95 12:51:35
>Subject: Re: Light intensity and water depth

>I have read that unless salt water/reef aquariasts are using a fairly shallow
>tank, then they use more intense lighting (e.g. Metal Halide, Mercury Vapor?)
>to reach the inhabitants of the tank.

I'm not sure if this is why but from the talk I have with a marine storekeeper,
he mentioned that in reef, the light need to penetrate the corals to be useful. 
In planted tank, the light just need to fall on the leaves. That is why they 
need more intense lighting.