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Cooling down light fixture?

A little while ago there was an interesting thread about which direction a
cooling fan should be blowing air into a light fixture. I have a mixture of
T-12 and CF lighting on my tank and this thread made me think about the heat
generated in the light fixture which originally came with the tank. It is an
all-glass twin T-12 fixture with no modifications what so ever (yet). Being
a "cheap" product, does anyone feel this kind of fixture would perform
better with a cooling fan mounted on one end (or both) or should I assume
that these were designed to cool themselves down to optimum temperatures?
Also, does anyone use solar panels to run their fans? (I have a few extras
and was thinking it could save me some time in avoiding the wiring...) After
all there's plenty of light in that box.


Giancarlo Podio