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Old 09-28-2005, 10:47 AM   #1
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MH question.

How far would a MH bulb have to be up off the tank to cover 4 foot?

I double checked my center brace in my tank.. its glass with a little strip of plastic siliconed to the top of it to use the glass hinged hoods.. The plastic strip can be removed without much issue..

That is if a glass center brace isnt a problem.. wich Im assuming it isnt..
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Old 09-28-2005, 12:41 PM   #2
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I was pricing MH and thought it would be cheaper to get a single 400watt rather then 2-175watt lamps for my 75 gallon.. it could be done for less then $150 depending on the bulb I chose to get..
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Old 09-28-2005, 02:09 PM   #3
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Can a single MH even cover 4 feet of tank?
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Old 09-28-2005, 02:44 PM   #4
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possibly... but i wouldnt count on it...

i was personally looking at 2x250 mh's for my 75g
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Old 09-28-2005, 02:55 PM   #5
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You will get about a 2 foot square coverage area from 1 mh bulb. If you center it on a 4 foot tank both ends will be somewhat dark.
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Old 09-28-2005, 03:04 PM   #6
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^^ I agree- 3 ft is really pushing a single MH, 4 ft would be impossible.
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Old 09-28-2005, 03:46 PM   #7
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One bulb will not do a 4' tank unless you would be willing to accept the two sides to be in near total shadow and the middle to be insanly intense with light.

For 4' long tanks you should spec two MH bulbs both mounted about 1' in from the sides. This will split the difference on the center brace and any shadows that the brace might cast will be negated by the opposing bulb. A single bulb setup over the brace would also cast a shadow into the tank if the brace is not totally transparent.

Unless you was going to go for a full SPS tank you can get by with 175W mH bulbs over the 75. When doing MH you should match the ballast wattage with the bulb wattage. I like XM brand bulbs.
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Old 09-28-2005, 05:25 PM   #8
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I notice you have an oceanic tank, if the warranty is an issue, you do NOT want to remove the center brace..it will violate the warranty.
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Old 09-28-2005, 08:30 PM   #9
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In addition to compromisting the integrety of the tank. The brace would not be there if it was not needed for the better of the tank.
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Old 09-29-2005, 12:45 AM   #10
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its not a brace.. *edit* acutuall numbers posted next.. I was guessing*edit* the actuall brace is a very thick sheet of glass over about 5/8" thick.. and about 6 inches wide.. the plastic is just a little strip glued on top of the center brace to it to accept standard double glass hoods.. (the plastic isnt even physicly connected to the front and back braces.. theres about a 1/16" gap).. its not helping integrity at all from what I can tell.. do I need to post a pic of this? it is strange that they put the plastic there IMO.
and the tank is actually very old.. not quite out of warntee I doubt .. I think they waranteed it for 20-25 years 8O, but Im not the original owner..

Ok.. the answer to the MH question is that 4' is really a streach.. but.. now that Ive noticed that this little strip of plastic is just there for mecanicly seperating dual glass hoods.. would it be benificial for me to remove it if I decided to go with VHO or other floresnt lighting? Or would the plastic strip not really matter in that case.. Im guessing it wouldnt.. ie leave it alone..
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