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Re: [APD] How much light actually gets down here?
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.
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
> Low-light plants grow reasonably well in there, but
> I'm considering an upgrade and wondered how much light
> would reasonably reach the bottom.
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> Aquatic-Plants at actwin_com
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