Well - consider this. Glass light transmission is 72% vrs acrylic at 91% -
so if you need that cover on there, you can re-place it with some good
acrylic and still have a cover on the tank. With a typical tank setup that
uses 2 sliding glass panels for the cover (some are 2 peices hinged) there
is a strip of double pane glass that will reduce the effectivness of your
lights - say 1 glass pane will drop your lights down to 72%, and then a
second peice will drop that by another 29% to ~50% of the original light -
seems like a lot I know - but this is what all the experts tell me. Acrylic
will help a lot, but if you can get away with nothing - theres a lot of
additional light. I ended up using a peice of acrylic cut to shap so it only
covered the front half of my tank, and the lights have nothing below them.

"Robert" wrote in message
...
Group:
Has anyone found the results of studies on the effects of glass covers on
the lighting intensity levels (amount of loss) and which particular wave
lengths are most affected?

I'm using 1/4" plate on my 120 to retard evaporation and also to keep the
discus from wetting down the floor at feeding time. I could live with the
water additions and wiping if my light quality/quantity is being
significantly affected. The CF's have their own shielding so they'd
remain
protected from the moisture. Any factual information out there on this?
Are there differences in types and/or thicknesses of glass?

Thanks,

Robert




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