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Old 07-19-2006, 01:28 AM   #1
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MH Lighting 4" over 75g tank - HEAT??

Hey All,

I am planning my upgrade and I am looking to get a MH fixture from Current. Its 2x150@10K + 2x130PC Actinic with electronic ballasts'

The problem is, I can not hang it over my tank, so I will be using the "legs". That will place it appox 2-3" above my tank. The tank dims are 48x18x20

Should I be concerned about heat? The tank will have at least a 20g sump and a separate 10g fuge. I will have a heater in each of the sumps/fuges and there will be no powerheads in the main. Flow will come form the returns and a closed loop system. I will probably have a small fan in the cabinet to keep that area cool as well.

My current set up only has PC lighting, so I do not know what to expect as far as heat exchange. I can not afford a chiller at the moment, although I will have one before next summer. The tank should be up and running in Sept, so hopefully the weather in so cali will cool down a bit.

Sorry for the long post.

Thanks

John
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Old 07-19-2006, 10:55 AM   #2
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That was my concern as well, so I am considering going 8x54 T5 lighting since it's so much cooler.

I have PC also.
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Old 07-19-2006, 05:01 PM   #3
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Quote:
Should I be concerned about heat?
Yes. Going by what I have- 2x250 MH/ 2x110w VHO 10" over a 55gal in a canopy- I think you will be alright. The fixture your buying is enclosed and has it's own fans right?
Quote:
The tank will have at least a 20g sump and a separate 10g fuge....there will be no powerheads in the main
That will help dissipate/eliminate heat also.
Quote:
I can not afford a chiller at the moment, although I will have one before next summer. The tank should be up and running in Sept, so hopefully the weather in so cali will cool down a bit.
So in a worst case scenario you will just have to blow a fan across the top of the tank for a short while or put some 2x4's under the fixture to lift it- Although I don't think either will be necessary.
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Old 07-19-2006, 07:50 PM   #4
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Quote:
The fixture your buying is enclosed and has it's own fans right?
Yeah, the fixture has its own cooling fans and an internal electronic ballats, which I have heard run cooler. is this true?

Quote:
Going by what I have- 2x250 MH/ 2x110w VHO 10" over a 55gal in a canopy
I am not going to have a canopy. Its going to be an open top with the fixture above. That shoudl help as well.

Thanks
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60gal reef in progress
75lbs Live Rock
40lbs Live Rock
AquaC Remora Protein Skimmer
Marineland penguin HOB Filter
4x65w PCF

FISH
1 - Percula, 1 - Blue-Yellowtail Damsel, 3 - Green reef Chromis

Inverts
Rose Annenome; Anchor Coral
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Old 07-20-2006, 01:57 AM   #5
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Quote:
internal electronic ballats, which I have heard run cooler. is this true?
Yes E-ballast run cooler than magnetic.
Quote:
am not going to have a canopy. Its going to be an open top with the fixture above
That's what I was assuming, that should help dissipate heat more efficiently as well. HTH
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