How high should the MH be from the water???

blennymower · 05/13/2009, 06:26 PM

How high are you're MH from the water??

Anemonebuff · 05/13/2009, 06:33 PM

The bulb itself is 10" from the water.

blennymower · 05/13/2009, 06:35 PM

what are you cooling your tank with?

Anemonebuff · 05/13/2009, 06:44 PM

One 3" computer fan blowing over the water and one in the fixture.

blennymower · 05/13/2009, 06:46 PM

more or less whats the average temp on your tank?

Also, what do you think about placing a fan on the sump instead?

Ehaze · 05/13/2009, 07:04 PM

I had 2x 250 watt phoenix bulbs 4" above my water. tank heat is as I set it, 78 heaters on 78.5 heaters off. the room its self is 69F

Kent D. · 05/13/2009, 07:08 PM

my outer orbit is about 6 to 8 inches from the water with the the factory legs provided by current.......is 10 inches really manufacture's recommendation for a 150 watt MH? I really hate the 10k bulb that comes with the light when you buy it from Current. Thinking about a 14k. Does anyone know how much growth I will lose if I go to 20k with my corals?

imcosmokramer · 05/13/2009, 07:21 PM

my 2x250 4x54w outer orbit is 8" above the water.

Mopar Reefer · 05/13/2009, 07:45 PM

My (2) 250 watt MH's are 6" from the water and no cooling issues on my 100 gallon.

blennymower · 05/13/2009, 07:52 PM

Quote:

Originally posted by Ehaze
I had 2x 250 watt phoenix bulbs 4" above my water. tank heat is as I set it, 78 heaters on 78.5 heaters off. the room its self is 69F

You have the benefit of having a room at 69 degrees!

My normal room temperature is ~75 F

The reason I asked was because I had my MH fixture just on the legs it came with which had it at about 4.5'' from the water and with that the temperature would shoot up to 86 degrees! And with a fan blowing across the sump it would be around 82 and 84. I now have it at ~10 inches from the water and the temp for the whole day remained between 80 and 82 without a fan.

Anemonebuff · 05/13/2009, 10:06 PM

Quote:

Originally posted by blennymower
more or less whats the average temp on your tank?

Also, what do you think about placing a fan on the sump instead?

79-82F. 79 winter and 82 summer. A fan on the sump would probably work well. The more surface area it blows across the more it will evaporate and cool the tank.

05/13/2009, 06:26 PM	#1
blennymower Registered Member Join Date: Nov 2008 Location: Miami, Florida Posts: 1,477	How high should the MH be from the water??? How high are you're MH from the water?? __________________ Check out my tank. Current Tank Info: 30G Nano Rimless

05/13/2009, 06:35 PM	#3
blennymower Registered Member Join Date: Nov 2008 Location: Miami, Florida Posts: 1,477	what are you cooling your tank with? __________________ Check out my tank. Current Tank Info: 30G Nano Rimless

05/13/2009, 06:46 PM	#5
blennymower Registered Member Join Date: Nov 2008 Location: Miami, Florida Posts: 1,477	more or less whats the average temp on your tank? Also, what do you think about placing a fan on the sump instead? __________________ Check out my tank. Current Tank Info: 30G Nano Rimless

05/13/2009, 07:04 PM	#6
Ehaze Registered Member Join Date: Jul 2007 Location: Thornton, Colorado Posts: 1,259	I had 2x 250 watt phoenix bulbs 4" above my water. tank heat is as I set it, 78 heaters on 78.5 heaters off. the room its self is 69F __________________ 75g SPS tank, 30gal sump/refuge. Melev RO/DI, Coravue duel calc reactor, MSP 200 skimmer, 2 Vortech MP40, Mag drive 9.5 return, autotopoff.com ATO, 2 CoralVue 250W SE finished pendants(with 20k Radium bulbs), powered by 2x Icecap ballasts, controlled by a ACJR.

05/13/2009, 07:21 PM	#8
imcosmokramer Registered Member Join Date: Feb 2008 Location: Cleveland, OH Posts: 1,709	my 2x250 4x54w outer orbit is 8" above the water. __________________ You can agree with me, or you can be wrong. You pick.

05/13/2009, 06:33 PM	#2
Anemonebuff Registered Member Join Date: Feb 2001 Location: LI,NY Posts: 3,877	The bulb itself is 10" from the water.

05/13/2009, 06:44 PM	#4
Anemonebuff Registered Member Join Date: Feb 2001 Location: LI,NY Posts: 3,877	One 3" computer fan blowing over the water and one in the fixture.

05/13/2009, 07:08 PM	#7
Kent D. Registered Member Join Date: Apr 2009 Location: NY Posts: 684	my outer orbit is about 6 to 8 inches from the water with the the factory legs provided by current.......is 10 inches really manufacture's recommendation for a 150 watt MH? I really hate the 10k bulb that comes with the light when you buy it from Current. Thinking about a 14k. Does anyone know how much growth I will lose if I go to 20k with my corals?

05/13/2009, 07:45 PM	#9
Mopar Reefer Registered Member Join Date: Jan 2009 Location: Fort Walton Beach Posts: 465	My (2) 250 watt MH's are 6" from the water and no cooling issues on my 100 gallon.