Hmm... Somewhat interesting reading, seems we must have read different parts
though. It does however make me wonder how hot a MH lamp is a at close
range.

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My Web Site: http://showcase.netins.net/web/reefpage/




"PaulB" wrote in message
. com...
A common urban legend. Old glass is thicker on one end because of the
manufacturing process, it was installed thicker end down because it looks
better that way than random alignment.

http://www.urbanlegends.com/science/glass.flow/



"Benjamin" wrote in message
...
I have some 100 year old glass panes that are thicker on the bottom than
on
the tops. Just thought I'd point out that glass is a liquid also. Even
so,
I'd use glass over acrylic any time. As for open vs. closed top. I
can
see both sides of the debate... so I run half tops. The wavelength
filtering properties of glass or acrylic over a reef tank can get real
complicated fast.

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My Web Site: http://showcase.netins.net/web/reefpage/


"Doug and Lois" wrote in message
...
This may be a dumb question. Are there any problems with using acrylic
as
a
tank cover with the light hood above it? In other words, will the
acryllic
filter out any important light wavelengths? Is glass better or worse
for
this purpose and why?

Just curious

Doug