MH distance to water?

hotwire284

hotwire284

New Member
how much disance should you have from the MH bulbs to the water level? does it matter as long as you have a fan?
 
hondo

hondo

Member
my 175w is about 4" from the water surface and I have no heat problems but I use a fan in my sump which provides quite a bit of cooling. I would say 6" - 8" is optimum but it all depends on if you use fans blowing directly accross your tank surface or not, if so the bulb can be lower. Or in my case without the sump and the fan blowing on the sump I'm sure I would have a heat problem with the MH 4" off the surface.
 
gregvabch

gregvabch

Active Member
i'm sure that i'm just misunderstanding you, but how would the fan blowing on your sump alleviate the heat produced from your lights on your fish tank? my chiller runs in my sump, so something like that?
 
me-n-my-fish

me-n-my-fish

Member
my mh are 6" above.
btw....blowing air across the body of water will cool that water. but depending on the size of his sump, and the amount of air, it might not be enuf........
 
S

starfishjackedme

Guest
I run mine 10" but i have 400watt bun burners. They're hot enough to bbQ hotdogs under.
 
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