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11-20-2004, 02:03 PM
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#1 (permalink)
| | Bristle Worm
Join Date: May 2004 Location: Huntsville, Alabama
Posts: 139
Karma: 38
 
|  MH lights raising water temp
I just got my new MH bulbs in today and fired them up for the first time and my temp is steadily going up, It started at 79.7 and 4 hours later its 81.9. I dont know how hot it too hot ive heard as high as 86 or 87 would be ok but Im not sure. Any advice is appreciated.
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20G Mini Reef - 130w PC - 30lbs Fiji live rock - 25lbs special grade reef sand - CPR BakPak
90G Cichlid Tank - 80w lighting - skilter 250 - emperor 400 - Magnum 250 - MJ 1200 | 
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11-20-2004, 02:22 PM
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#2 (permalink)
| | Fire Shrimp
Join Date: Sep 2004 Location: Tampa, FL,Florida
Posts: 330
Karma: 2
| Re: MH lights raising water temp
86? I don't think so.
I would say 82 is OK, but not desirable. You should have some area in the canopy for the hot air to get out. And then maybe add a fan to get the temp down.
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90 gal, 120 lbs sand, 90 pounds live rock (adding), 5 blue-green chromis&&&&10 gal, softies, one Ocellaris Clownfish, one clowngoby, one cbs and lots of rock && | |
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11-20-2004, 02:26 PM
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#3 (permalink)
| | Torch Coral
Join Date: Feb 2004 Location: Vancouver, WA,Washington Age: 21
Posts: 1,167
Karma: 2
| Re: MH lights raising water temp
i would try to keep it under 80. Yeah a fan would help. how far are ur lights above your water. they should be 8-10". mine are about 10" off the water. My temp is about 76-77 when mine are on. | |
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11-20-2004, 02:36 PM
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#4 (permalink)
| | Bristle Worm
Join Date: May 2004 Location: Huntsville, Alabama
Posts: 139
Karma: 38
| Re: MH lights raising water temp
I do have two 4" fans in the hood with an open back and the bulbs are exactly 7inches from the water surface. I have 2 - 250 watt MH bulbs over a 90 gallon. If it gets over 83 I guess ill shut em off... | |
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11-20-2004, 02:45 PM
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#5 (permalink)
| | Eyelash Blennie
Join Date: Sep 2004 Location: Lakeland, Fl
Posts: 1,294
 
| Re: MH lights raising water temp
I have the same setup here with the 2 - 250w mh bulbs. I turn them on for 4 hours in the morning and 3 hours in the evening. It helps keep the temperature down (around 81 degrees F), and right now nothing I am keeping requires that much light. I leave the 190 watts of actinics on from 6:30 in the morning to 7:00 at night. I sure can't afford a chiller and would prefer not to use one!
I wonder if a sheet of tempered glass between the bulbs and the tank would minimize some of the heat transfered?
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90 Gallon glass, 135#'s of rock and 2" sand. 2-250w 20k XM metal halides. 2-95 watt actinic VHO, 4 powerheads, Coralife skimmer. Maroon Gold Striped Clown, Blue Chromis, Kole Tang, Pygmy Angel, Serpent Star, Brittle Star,Gorgonians, Mushrooms, Yellow Polyps, Turbo Snails & Blue Legged Hermits. 20 gal sump with Caulerpa, Mag 7 return pump. | |
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11-20-2004, 03:00 PM
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#6 (permalink)
| | Bristle Worm
Join Date: May 2004 Location: Huntsville, Alabama
Posts: 139
Karma: 38
| Re: MH lights raising water temp
I wonder if a sheet of tempered glass between the bulbs and the tank would minimize some of the heat transfered? <--- I was wondering the exact same thing , I guess it wouldnt hurt to try. | |
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11-20-2004, 03:29 PM
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#7 (permalink)
| | Whip-Lash Squid
Join Date: May 2004 Location: PhillySuburbs, Pennsylvania Age: 42
Posts: 2,947
| Re: MH lights raising water temp
I have my 175 W metal halide in a canopy with a piece of plexiglass.
1. It keeps the bulbs clean and safe.
2. It keeps some of the heat out of the tank. It gets vented with one fan on one side and just an opening directly opposite the fan.
BUT
glass or plexiglass will cut down on some of the light that actually gets down into the aquarium.
_________  I Love My Sig By John Hawkins!!!!!!!!!!!!!
Date Started 9/04 58 gallon Oceanic Tank, 20 gal DIY sump/fuge w/ Kent Marine Auto top-off, Air Water Ice RO/DI, 10,000 K 175 W MH, 2 VHO 03's 96W each, AquaC EV 120 Skimmer
80 lbs LR, DSB in FUGE, 1 - 2 " LS in tank
Black Brittle Star, Chevron Tang, Crocea Clam, red & green Lobophyllia, Frogspawn, Porites Frag, Caulastrea Frag, Green Ricordia, Asst. Zoas, hermits, astreas, stomatellas, fighting conch  | |
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11-20-2004, 04:05 PM
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#8 (permalink)
| | Giant Squid
Join Date: Dec 2002 Location: Marina del Rey, California
Posts: 3,524
| Re: MH lights raising water temp
[quote author=birdlady link=board=ASAP;num=1100995412;start=0#6 date=11/20/04 at 17:29:59]Iglass or plexiglass will cut down on some of the light that actually gets down into the aquarium.
[/quote]
If you keep the glass cleaned weekly the 250w bulbs should be fine in reaching the bottom of your tank.
_________ Just tryin to recreate God's perfection in a glass bowl. 20 Gallon Reef W/Live Rock, mated pair of Maroon Clowns, Softies, 110 watts PC 10,000k lighting, and skimmer.  | |
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11-20-2004, 06:35 PM
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#9 (permalink)
| | Eyelash Blennie
Join Date: Sep 2004 Location: Lakeland, Fl
Posts: 1,294
| Re: MH lights raising water temp
Wondering if a sheet of tempered glass between the bulbs and the tank would minimize some of the heat transfered?
Great minds think alike :-)
Jim | |
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11-20-2004, 08:38 PM
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#10 (permalink)
| | Bristle Worm
Join Date: May 2004 Location: Huntsville, Alabama
Posts: 139
Karma: 38
| Re: MH lights raising water temp
Well the temp got up to 83.5 and probably still rising before I pulled the plug. I raised the hood 1 1/4 Inch higher so the bulb is now 8 1/4 inches from the water surface instead of 7, the hood dosent look as good as it did but... I hope this works , If not I'll add another fan or 2 and if that dosent work a baseball bat should do the trick. | |
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