Re: [APD] How much light actually gets down here?

[Vaughn Hopkins <hoppycalif at yahoo_com>]

22 inches of clean water will not absorb much light, so you can  
assume that the same amount of light will reach the bottom as would  
reach that distance with air in the tank.  The only difference I see  
is in the reflection off the glass sides of the tank, which will be  
different with water in the tank.  How much light you lose in 22  
inches depends on the type of reflector you have, if you have one,  
since the bulb sitting above the tank with no reflector loses light  
proportional to the square of the distance the light travels, but  
with a good reflector it loses less than that, and with a perfect  
reflector it loses very little.

Vaughn

On May 3, 2007, at 6:45 AM, Erin Poythress wrote:

> Hi everyone,
>
> Anyone know a reliable way to estimate how much of my
> 65W PCF reaches to the bottom of my 37G? The tank is
> 22" high and the legs of the light have it sit 1.5"
> above the glass lid (which is a necessity because of
> two very curious kitties). I tried to sit it flat on
> the lid, but the plastic joint got too hot for my
> comfort.
>
> Low-light plants grow reasonably well in there, but
> I'm considering an upgrade and wondered how much light
> would reasonably reach the bottom.
>
> Erin
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