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Old 02-18-2008, 06:31 AM   #11 (permalink)
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Default Re: NOW it's getting costly - ?

Mine has the center brace - this is so bizarre I just don't understand. How do I go about adding a fan to the lights (I mean wiring it up and where to buy the things I'll need). Thanks -
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Old 02-18-2008, 07:35 AM   #12 (permalink)
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Default Re: NOW it's getting costly - ?

Computer fans are cheap and easy. You want to position one so it pulls fresh cooler air into the canopy and the other at the other end to push the hot air out.
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Old 02-18-2008, 08:47 AM   #13 (permalink)
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Default Re: NOW it's getting costly - ?

Most computer fans run on DC power, not AC, and most are 12 volt DC. So, you need a small power supply for them too. I use one I purchased at RadioShack, that is a variable output voltage. Then I operate the fan at about 8 volts instead of 12 volts, to slow it down and reduce the noise. Wiring it up is very simple - if the fan runs clockwise when you want it to run counterclockwise, just reverse the connection at the fan. Mine runs 24 hours a day.
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Old 02-18-2008, 09:19 AM   #14 (permalink)
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Default Re: NOW it's getting costly - ?

Quote:
Originally Posted by 90gal View Post
So I got replacement glass today, a whole new glass top. The bulbs are NOT touching the glass. Ten minutes with the new glass - CRACK! At this rate, I'll need to replace the glass top 3 times daily. For the moment - I have wedged 2x4 pieces under the ends to hold the light fixture 2 inches above the glass - we'll see if we can bust the other one out...
While I don't have your fixture (obviously ) I had the same problem with the heat cracking my glass top. I did 2 things. I got tempered glass (used for ovens) at a glass place - it didn't cost much more. I made me some rubber spacers to sit the fixture on. They lift the fixture off about 1/2" and that is enough to circulate the air. I have had no more problems. Before I did this I lost 2 pieces in the top. Here is a px of the spacers





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Old 02-18-2008, 09:40 AM   #15 (permalink)
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Default Re: NOW it's getting costly - ?

I'm not a big fan of lights resting on the glass for several reasons- and a big one is I live in FL and tend to have problems with heat in the summer. Another is I live in FL and with the electrical storms we have here the further electrical equipment is from water the more comfortable I am. I like your rubber spacers, Tex- the rubber would definitely help in case anything ever shorted out inside the light fixture...
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Old 02-18-2008, 10:14 AM   #16 (permalink)
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Default Re: NOW it's getting costly - ?

Little rubber spacers may work for a CL fixture (with built in fans) but probably won't work for a AH-Supply retrofit.

I broke some glass w/ mine when I first got it too. You need some legs. I fashioned mine from some old hard drive brackets & metal braces. My 96W bulb now sits ~2.5" above my glass (thick window glass in back, original front section) and warms the black center brace enough I feel the need to keep a bit of white plastic (grocery bag) betweeen the lid & the brace. There's no way around it - those PCs do get hot.
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Old 02-18-2008, 10:49 AM   #17 (permalink)
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Default Re: NOW it's getting costly - ?

You know, I've wondered how hot AHSupply's bulbs get- probably will go with AH next time I need a fixture. I've wondered about heat issues with those canopy enclosures they build- they don't ever include fans, do they... hmmm
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Old 02-18-2008, 12:40 PM   #18 (permalink)
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Default Re: NOW it's getting costly - ?

The AHS enclosures don't include fans, but they are almost wide open at the top, with very large ventilation slots. I tried to substitute a large area of 1/8" holes on one enclosure to provide ventilation, but it didn't work at all well. So, I have used a cooling fan ever since. My hood is open at the back, and my fan blows air into the enclosure and it exhausts out the open back.
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Old 02-18-2008, 03:50 PM   #19 (permalink)
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Default Re: NOW it's getting costly - ?

Hoppy- I don't know too much about Sacramento's climate- is ever hot enough during the summer that you need to find ways to cool your tanks?
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Old 02-18-2008, 04:42 PM   #20 (permalink)
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Default Re: NOW it's getting costly - ?

Sacramento has a beautiful summer climate! (We can't ever acknowledge otherwise can we?) It gets to 100F several days during the summer, and rarely has a day under 90F all summer, so yes we do have water heating problems. The fan in the hood idea reduces the water temperature at least 5F in my experience, while evaporating quite a bit of water.
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