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View Full Version : Two 36 inch ati 6x39 watt t5 or 72 inch 14 bulb constellation fixture?


potpushr
02/28/2011, 12:53 PM
I currently have a coralife elite 3x250 watt metal halide 2x96 watt pc fixture on a 180 gallon 24x24x72 inch aquarium. Looking to switch to t5 and am wondering which setup will be better for my needs. Two 36 inch ati 6x39 watt fixtures or one 72 inch constellation fixture with 14 x39 watt bulbs? All suggestions greatly appreciated.

potpushr
02/28/2011, 03:10 PM
Forgot to say it. Will be sps dominant. Any suggestions please.

rtparty
02/28/2011, 04:51 PM
8x80w ATI Sunpower is the best choice IMO.

With the tank being 24" front to back I would go with 8 bulbs myself.

A 60" fixture over a 72" tank is not a problem. Raise the fixture up just a little bit and you will be fine. I ran a 24" fixture over my 36" tank for about 8 months and had no problems keeping anything I wanted.

James77
02/28/2011, 04:54 PM
I agree with rtparty.....

The 5' ATI fixture will give you plenty of light throughout the tank, and will be cheaper to replace bulbs.

potpushr
02/28/2011, 05:23 PM
How many inches above the water does 60 inch fixture need to be to evenly distribute light throughout tank? So 60 inch is better than 2 36 inch if I get the 8x39 watt fixtures too?

chuckreef
02/28/2011, 05:29 PM
Listen to RT; he's correct.
I have a 72 constellation on a 240 gal and a 10x powemodule on 48 x 30 wide x 24 depth of water.
There is no comparison between the powermodules and the consetellations.
less bulbs is less $ at bulb cahnge time. 8 x 25 = 125 v. 12 x essentially the same price.

chuckreef
02/28/2011, 05:29 PM
Listen to RT; he's correct.
I have a 72" constellation on a 240 gal and a 10x powemodule on 48 x 30 wide x 24 depth of water.
There is no comparison between the powermodules and the consetellations.
Less bulbs is less $ at bulb change time. 8 x 25 v. 12 x essentially the same price.

potpushr
02/28/2011, 06:22 PM
This is like music to my ears if I can spend less money and achieve better with the 60 inch ati power module than a 72 inch fixture or two ati 36 inch fixtures. I have a custom canopy that is about 13 inches off the the water is why I'm concerned with how high It needs to be for 72 inches

James77
02/28/2011, 07:05 PM
Not sure what height it needs to be at, but 13" is more than enough to play with. You'd probably have full coverage even at 5-7" off the tank. Just be sure that the ATI can vent with that canopy. It needs to draw fresh( if possible) air in the top and blow it out one end.

potpushr
02/28/2011, 08:21 PM
Ok I'm thinking the 60 is a the way to go since I will have less initial cost as well as bulb replacement cost and achiev my sps goals. Which 8 bulb color combo do you suggest?

rtparty
02/28/2011, 11:07 PM
5 ATI Blue Plus, 1 ATI aquablue and 2 ATI Purple Plus

potpushr
03/01/2011, 05:37 PM
The representative at reefgeek told me to use 1 GE white light bulb...is there any reason you don't use 1 white bulb? Are the color combos you gave me going to look like a 20k radium or similar?