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Offlinepsychonaut_420
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Registered: 02/13/06
Posts: 285
Loc: mid atlantic
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fluorescent heat
    #5382563 - 03/09/06 06:44 PM (17 years, 10 months ago)

I have 2 24" 40 watt fluorescent lights in a 4x4 enlosed grow box. I was wondering if anyone could tell me why my lights are getting so hot.i have a fan in the box but they still heat the grow box up. i used fluros in the past and they never got this hot ever. the light fixtures were really cheap so this could be a reason, but the lights in the fixtures are GE fluros for plant growth.


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OfflineHanky_discontinued
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Re: fluorescent heat [Re: psychonaut_420]
    #5382611 - 03/09/06 07:02 PM (17 years, 10 months ago)

The control gear (ballast/starter) will be making the heat, not the lamps.
I use two 50w compact fluros for veg and they make a bit of heat, nothing like HPS but still enough warmth to be noticeable.


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Offlinepsychonaut_420
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Re: fluorescent heat [Re: Hanky_discontinued]
    #5382675 - 03/09/06 07:19 PM (17 years, 10 months ago)

but i feel the tubes and they are really hot and i feel the heat radiating of them


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OfflineLegoulash
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Re: fluorescent heat [Re: psychonaut_420]
    #5387936 - 03/11/06 12:35 AM (17 years, 10 months ago)

Something is wrong with your light then, bad ballest, wrong light bulb, wired incorectly or somthing else.
is it a T12 T8 T5?

Is the fan you have ventalating your space or just moving air around the inside of the box?

Iv never seen a 24" 40w fixture.. just seems strang to me.


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Offlinejben
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Re: fluorescent heat [Re: Legoulash]
    #5389846 - 03/11/06 05:25 PM (17 years, 10 months ago)

there shouldn't be much heat. My T12's have been on for a month straight 24/7 and there is a very small amount of heat comming from them. Cheapness in the ballist doesn't matter? they're all around 7-12 bucks usually. (T-12s) maybe some faulty producT? I'd buy new ones before any possible fire could start.


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Invisibleshroomydan
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Re: fluorescent heat [Re: psychonaut_420]
    #5390270 - 03/11/06 08:11 PM (17 years, 10 months ago)

I too have never heard of a 40 watt 24" tube. Standard 40 watt tubes are 48".

Compact fluros put off some heat, enough to burn a finger. Sounds like you may have compact fluros; an exhaust fan may be in order.


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Offlinepsychonaut_420
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Re: fluorescent heat [Re: Legoulash]
    #5390386 - 03/11/06 09:07 PM (17 years, 10 months ago)

actually they are T12 20 watt fluros i was looking at the wrong number.

the fluros they came with were cheap and only an inch in diameter. i bought new fluros that are about 1.5 to 2 inches in diamer T12 20w they fit in the fixture fine but it still gets hot. i have a fan running inside the box and i leave the doors open when i can to help circulate the air more that helps bring down the temperature a little bit. the temperature has been around 85 to 90 degrees for a few days in my growbox with the fan on but the plants dont show any wilting or stress from the heat


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