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Old 03-31-2006, 12:19 AM   #11
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Are we confusing canopy with glass top? I have a matching wood canopy (pure astetics), but do not have glass tops on the tank itself. My lighting sits directly over the tank and the canopy conceals it.

A for gas excahnge no affect as it is open in the back and has open slots in top. I aslo run a sump.
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Old 03-31-2006, 02:01 AM   #12
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This is kinda funny but not funny, my Mom (yes I'm adult and I still capitalize Mom) is a botanist. Several of her friends and people who've worked at nurseries who supply the Dept have developed glaucoma (eyeball cancer is roughly how I understand it, but I'm out of the water on that one) and they all got it from repeated exposure to high pressure sodium lighting and metal halide lighting. And no, they didn't stand around staring at the light (Not THAT kind of botanical experimentation!!!), this was purely from just routine exposure. So Mom is a serious advocate on the whole canopy thing. It actually was her who jumped my case for exposing the baby to the halide pendant over my 58. So it took a plant freak to tell an ocean freak what should have been obvious... reefs are under constant and brutal radiation, and just like fishermen who get cataracts in age, anybody who exposes themself to the same intensity of light, or even a close approximation, is risking their eyes. I know it's a pretty benal thing to worry about, but after sitting at the dining room table, I have spots in my vision for hours. And that's just from what I catch on the peripheal. My partner is tall, so it doesn't bother him any, but I see the dog and they baby both wince from the aquarium area. Yet another reason to be anxious to get the project tank going (Getting good at justifying this, aren't I?)
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Old 04-01-2006, 06:19 PM   #13
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my 44 corner hex has a canopy and I like it, cause it keeps my Hawkfish from flying away (grin) Also looks nicer to me.

My 75 GAL has a canopy to hold the lights, but it stands off about 4 inches from the tank, so it is kinda open... I have wondered about evaporation and all that. Also, does it keep in the gases if it has a canopy? I would guess it would.
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Old 04-01-2006, 08:41 PM   #14
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if the canopy have a open back then it should be fine, right??
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Old 04-02-2006, 09:29 AM   #15
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Open back is fine just be careful of the glass tops. Really any canopy is fine but open back is better for heat escape.
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Old 04-02-2006, 02:53 PM   #16
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reefs are under constant and brutal radiation, and just like fishermen who get cataracts in age, anybody who exposes themself to the same intensity of light, or even a close approximation, is risking their eyes
Is it the intensity of the light or the UV radiation that causes the problem? Most MH lighting for our tanks have a UV glass shield which should minimize if not eliminate this risk.

I have a couple of corals that bleached white after going in my tank. They normally grow under intense sun so, after photo acclimating them, I placed them directly below my 150w MH lights, high in the tank. I asked Anthony Calfo about this at a demo he did last month. He speculated that I do not have enough light in the UV spectrum light for these corals.
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Old 04-02-2006, 10:33 PM   #17
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It is both the intensity and the UV. Even with the glass shield, that doesn't cut out all the UV, it just reduces it. Actinic light isn't the hottest to stare at either, but it won't hurt you as long as you're not reading under it or glaring at it wondering why only one ballast in the stupid thing works... grr... oh, where was I again?
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