T5HO bulbs and heat - The Planted Tank Forum
 
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post #1 of 11 (permalink) Old 01-19-2009, 04:32 PM Thread Starter
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T5HO bulbs and heat

I have built two lights that hold 4 36" t5HO bulbs. Currently I have a fan that blows through both lights. I run 4 bulbs most of the time with a burst where all 8 are on. I'm not liking the noise the fan creates.
How hot can the bulbs sustain? Does anyone make a good quite fan that only runs when temps get to hot? I'm using the Icecap ballats. Anyone use their fan they sale?
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post #2 of 11 (permalink) Old 01-20-2009, 03:40 AM
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Try using computer fans.
S-Flex, Noctua PF-12's for good flow and low silence, these fans are popular with computer enthusiast for their flow:noise ratio.


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post #3 of 11 (permalink) Old 01-20-2009, 12:33 PM Thread Starter
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Thanks, I think I may even have some of them lying around.
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post #4 of 11 (permalink) Old 02-03-2009, 06:32 PM
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The bulbs themselves can handle pretty high temps, but if you remote mount the ballast(s) then you shouldn't have too much heat under the canopy.

I don't believe the bulbs produce much heat on their own. Depending on your canopy design, you might not even need a fan.

Thanks,
AndrewH


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post #5 of 11 (permalink) Old 02-03-2009, 07:38 PM Thread Starter
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The canopy is open on both ends and is made out of aluminum. The aluminum gets very hot when all eight bulbs are running. The ballasts are IceCaps and are down below in the cabinet. Maybe I'll try and measure the actual temps inside the canopy.
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post #6 of 11 (permalink) Old 02-03-2009, 08:45 PM
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IceCap makes a variable speed fan with a temp. sensor (as you know). I almost got one last summer for my canopy. http://www.drsfostersmith.com/produc...68&pcatid=3868 I haven't used it personally, but have heard good things...
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post #7 of 11 (permalink) Old 02-04-2009, 12:06 AM
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I bought some small 4 inch personal fans for $4. from Walmart and Target
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post #8 of 11 (permalink) Old 02-04-2009, 11:21 AM Thread Starter
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I have thought about trying the IceCap variable speed fan. Might give that a try the next time I order something.
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post #9 of 11 (permalink) Old 02-06-2009, 03:06 AM
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IceCap overdrives the bulbs. The result is more light. Nice!

But also you get:

1. Much more heat
Normally T5HO don't make a lot of heat. I can put my hand on the reflector of each one of my T5HO lights and hold it as long as I care to.

2. Shortened life of the bulb
As if you care that it's going to be 2 years or 1 year. Why don't you care? Because of (3):

3. Crazy light spectrum
When overdriving a bulb the spectrum becomes what its was not meant to be. Buying a Giesemann Midday T5HO bulb and overdriving completely messes up what those German engineers worked hard to achieve. It's like buying a Porshe and hauling paving stone in it.

--Nikolay
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post #10 of 11 (permalink) Old 02-06-2009, 05:36 AM
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Very interesting to know!

Thanks,
AndrewH


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post #11 of 11 (permalink) Old 02-06-2009, 01:04 PM
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Quote:
Originally Posted by niko View Post
3. Crazy light spectrum
When overdriving a bulb the spectrum becomes what its was not meant to be. Buying a Giesemann Midday T5HO bulb and overdriving completely messes up what those German engineers worked hard to achieve. It's like buying a Porshe and hauling paving stone in it.

--Nikolay
Interesting. Where did you come across this? Curious as I have the 2x80w TEKII kits, which have the workhorse 7 ballast that overdrives them, and the giesemann midday and aquablue bulbs.

Based on that, would any T5HO bulb give similar results when overdriven?

Thanks,

John



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