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11-29-2004, 12:46 PM
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#1 (permalink)
| | Spanish Shawl Nudibranch
Join Date: Sep 2004 Location: ,
Posts: 75
Karma: 12
 |  how far from water for MH
how far from the water should a 250 watt MH be i am buying this fixture http://oceanencounter.com/Merchant2/...ory_Code=EVMHR
and am hoping to start building my hood soon and the only thing i don't know is how high it should be the tank is a 50 gallon tank that is 36 long 16 deep and 20.5 tall
and oh yeah the hood will be well ventilated using at least 2 80 mm comp case fans and 4 if needed as long as its not to loud | 
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11-29-2004, 01:32 PM
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#2 (permalink)
| | Eyelash Blennie
Join Date: Sep 2004 Location: Lakeland, Fl
Posts: 1,294
  
| Re: how far from water for MH
Ask them if this is a pulse start ballast. It allows you to choose from a wider variety of bulbs if it is. I have mine 12 " above the water. It depends on how hot the room is? Some people experience a huge temperature rise and have to put lots of fans in there canopy and others buy a chiller. I'm sorry to say I don't know a formula for calculating a temperature rise using mh bulbs. As far as I know it is a trial and error kind of thing. If you find out anything different let me know.
Jim
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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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11-29-2004, 01:48 PM
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#3 (permalink)
| | Giant Squid
Join Date: Nov 2004 Location: Los Angeles, California Age: 21
Posts: 3,448
| Re: how far from water for MH
eh...heck for 50 gals u really could just go with pc or t5s if u are worried about the heat...i have a 55 gal with pcs and my acros r fine with the light... _________ Tank Specs:
55 Gallon Mixed Reef
48" Tek Light: 4-54W T5 HO Fluorescents
Bulbs:
1 x 54w Fiji Purple T5 HO Fluorescent
1 x 54w Super Actinic Blue T5 HO Flourescent
1 x 54w 14000K AquaBlue 75/25 T5 HO Fluorescent
1 x 54w 10000k AquaSun T5 HO Fluorescent
Hard Stuff:
100+ lb. Fiji Live Rock
65+ lb. Live sand
http://www.teslamotors.com/images/ba...la_banner6.jpg | |
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12-01-2004, 12:38 PM
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#5 (permalink)
| | Torch Coral
Join Date: Feb 2004 Location: Vancouver, WA,Washington Age: 21
Posts: 1,167
Karma: 2
| Re: how far from water for MH
i would like put them at about 6" or 8". that's what mine are at. At 12" you lose a lot of light that could be used by your acros. | |
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12-04-2004, 12:29 AM
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#6 (permalink)
| | Fire Worm
Join Date: Jan 2004 Location: Moreno Valley, CA,California
Posts: 172
Karma: 1
 
| Re: how far from water for MH
They say that every 12" above the water you loose "half" the intensity of the MH lighting. If you main concern is heat, I'm not sure if I would spend the money on MH lighting. I'll see if I can find the link for you to read, somebody else on 3reef sent it to me.
CowboyUp [smiley=cowboy.gif] _________ 135G all glass. 150lbs LS, 200lbs LR. 20G Sump, DIY 20G Refugium. Protein Skimmer. 6x96watt PC's, 3x250watt MH's. Hammer Coral, FrogsSpawn, Green Carpet Anemone, Hairy Mushroom, Toadstool Mushroom. Maroon Clown, Purple Tang, Pacific Blue Tang, Kole Tang, Flame Angel, Coral Beauty Angel, Copper Banded Butterfly, Spotted Hawk, Coral Banded Shrimp, Serpent Star, Brittle Star. "Whiskey for my men, beer for my horses" | |
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02-17-2006, 05:59 PM
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#8 (permalink)
| | Coral Banded Shrimp
Join Date: Feb 2006 Location: Dayton, Ohio Age: 46
Posts: 366
Karma: 142
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Cowboy!
That sie isterrific! Thanks | |
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