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Old 06-27-2011, 02:09 PM   #11
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If you get a 75 it will be 4 feet long, and 18 inches from the back of the tank to the front of the tank. It is I think 21" deep, from top to bottom.

You would want a 4ft fixture on a 4ft tank, if you go smaller you will have a dark spot on either end of your tank.

The spectrum depends on what you like. I have 2 whites ( 12000k) and 2 blues on my 48" fixture. The higher the number the bluer it gets. I tend to like a blue-ish hued tank myself. they make purple bulbs too that you can mix in and get a different hue.

My 125g has 6 10000k bulbs and 6 blue bulbs. I find the color to be too "white" for me.

180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.
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Old 06-27-2011, 04:49 PM   #12
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kelvin rating is the color temperature of the lamps, it has a light effect on the brightness, but we don't worry about that. as for the wattage the longer the T5 the higher the wattage. all T5s will give you the sam light output in a messured area, IE. in a 6" length of a 24" and a 48" lamp they will both put out roughtly the same light output.

as for putting a 3ft ligth on a 4ft tank , you will be loosing out on a foot of aquarium for higher light corals, it will still get lite up but not well

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light, lighting

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