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Old 06-30-2007, 05:27 PM   #1
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Metal Halide's

I have a 105 gallon reef tank with the odyssea 150 Metal Halide hood on it. Im considering upgrading to a PFO 400 watt halide system for the SPS any suggestions on which to go with?
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Old 06-30-2007, 06:31 PM   #2
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Just a comment..that seems on the low end of lighting for SPS.
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Old 06-30-2007, 07:19 PM   #3
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Depending on the depth of the tank, you might be ok with 250's. I use 2 250's on my 6ft 180 and it is plenty. I think 400's are normally overkill unless your tank is really deep.

Are you looking for a retro or a complete fixture?
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*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,
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Old 06-30-2007, 08:38 PM   #4
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Just a comment - Hara was a little vague with his response :p

A 400 certainly isn't on the low end for any lighting - but just one of them is for SPS on a 105.

Two of them would be great on a 105, at around 8 watts per gallon, but those bulbs will put off a lot of heat.
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180G build thread

180G All-glass with dual megaflows in a custom stand
AquaC EV-180 skimmer
250 pounds LR
160 pounds aragonite
Custom acrylic sump from GlassCages.com
2xPCX-40 return pumps
2x250MH 14K, 2x175MH 14K - PFO lighting, 2x65W PC
No-name 36W UV
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Old 06-30-2007, 09:08 PM   #5
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I dont think I was vague at all. I read the post to mean one 400 watt mh bulb on the tank. IMO that would not be good enough for SPS. Maybe that is not how the post was intended to be read, but that is what I saw.

and...I am a she, not a he.
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Old 06-30-2007, 11:20 PM   #6
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Without knowing the depth of the tank or the width, anything is a best guess. I think 400's are overkill for most things. MH's have a 2ft light coverage. I have seen people use 2 400's on a 6ft 125 tank and it worked well. MH do not fit the WPG rule very well either. 175's might meet the WPG rule but if the tank is real deep, they won't penetrate like a 250 or 400.

I think we need more info from JPUCKET
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*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,
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Old 07-01-2007, 12:05 AM   #7
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I've always read 18" or less, 175W. 18" - 24" = 250W, and >24" 400's.

i know, its like MPG on a car. It's a "guideline", and YMMV =D
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180G build thread

180G All-glass with dual megaflows in a custom stand
AquaC EV-180 skimmer
250 pounds LR
160 pounds aragonite
Custom acrylic sump from GlassCages.com
2xPCX-40 return pumps
2x250MH 14K, 2x175MH 14K - PFO lighting, 2x65W PC
No-name 36W UV
Water General 125GPH RO/DI
Filstar XP3
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Old 07-01-2007, 10:56 AM   #8
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I think a full description if the lighting is needed to give advice here . 1 metal halide would be Ok if all SPS is in the 2 foot patch under it with aux. lighting (T5, VHO) for the rest of the tank as needed . Give us your full lighting .
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Old 07-01-2007, 11:23 AM   #9
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As mentioned, we need to know dimensions of your tank and a lot omore info on the lighting system...how many bulbs, what type, etc?
In general, MH lights have a throw pattern of 2 sq ft. Meaning, for every two feet of lenght in your tank you should have one MH bulb. A four foot tank would need two bulbs to be lit properly. Wattage of the MH lights is really going to depend on two things...what you wish to keep and how deep your tank is.
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Old 07-01-2007, 12:24 PM   #10
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The tank is 28'' in depth and 51'' in length. this is what im considering a
PFO-48SL10400-2-400 10K Metal Halide Lamps
-1-400 Watt Dual PFO Halide Ballast
-2-96W 7100K PC Lamps
-Tempered Glass Lens
-95% reflective Reflector focus's light into the tank.
-Low Profile- 5.5" High, 11" Wide, 49" Long
-All Ballasts External
-1-3" Fan

also i do have a 1/4 horse chiller on the tank as well.
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