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Old 11-07-2003, 11:42 AM   #1
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MH bulb or reflector 8" from water?

When measuring the suggested 8" from water level, do I make the reflector 8" and the bulb is actually closer or do I measure from the bottom of the bulb to the water level? I"m assuming it would be 8" from the bottom of the bulb to the water.
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Old 11-07-2003, 12:55 PM   #2
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I would just do a "Best Guess" Measurment Mine is about 8" from the water to the bulb.. With MH lights I really dont think an Inch or two higher is going to make a difference since most literature recomends 12" from the water surface to the bulb.. But as you know this is not what most follow..

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Old 11-07-2003, 02:03 PM   #3
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I go right from the lowest part of the bulb. 8" is for glass tanks and the 12" is for acrylic tanks. Acrylic can't take the heat as well so it needs to be a touch higer.
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Old 11-07-2003, 03:11 PM   #4
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Sounds good, do you guys mount the bulb/ballasts parallel or perpendicular with the tank?
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Old 11-07-2003, 03:33 PM   #5
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Mine is a flat reflector ran parallel to the tank.. here is a link to a post which has a pic of my retro fitted hood.. http://www.aquariumadvice.com/viewto...600&highlight=

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Old 11-07-2003, 05:50 PM   #6
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I also like mounting parallel. Most reflectors do not have fronts on them and will blind you when you open the canopy if you mount them perpindicular. Either way works fine though.
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Old 11-07-2003, 06:46 PM   #7
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To get the most out of the bulb...they should be mounted perpendicular, if space allows. You will lose less light out of the front of the tank with a perp parabolic reflector and bulb
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Old 11-07-2003, 07:36 PM   #8
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Quote:
Originally Posted by reefrunner69
To get the most out of the bulb...they should be mounted perpendicular, if space allows. You will lose less light out of the front of the tank with a perp parabolic reflector and bulb
Is a parabolic reflector one that has a front on it? My reflectors are open on the front but if mounting perpindicular it better I don't mind doing it because I have a front on my canopy.

Also, if I do mount parallel do I want the open end of the reflector(bulb tip) pointing towards the side of the tank or pointing towards each other in the center?
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Old 11-07-2003, 08:31 PM   #9
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Parabolic reflector

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Old 11-08-2003, 01:40 AM   #10
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Ok, that's what I have
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