Re: [APD] Light and Lids

[Jerry Baker <jerry at bakerweb_biz>]

Mariano F. Bonfante wrote:
> With a luxometer I messured 11% loss. The same value was obtenied with 3 mm 
> to 6 mm glass.

I do believe that nearly all of the loss with glass occurs due to 
reflection at the physical boundaries (i.e., the interface between air 
and glass). No matter how thick the glass is within a normal range found 
on an aquarium, the loss will be the same. I always understood that 
about 7% was lost at each surface with normal uncoated glass. Seems like 
if that was the case, a lid would be predicted to lose about 13.5%, but 
that's not far out from what you measured.

-- 
Jerry Baker
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