Just need a little help lighting question?

Currently I have a 75g with the mesurments of Length 51 inches, width 16
height 24, The lighting I have now is a 400W Mh. I am wanting to install 4 T5's to go with my current set up. My question is will buying the 48 inch retro fit kit for the T5's be enough to support SPS, and... is the 48 inch retro kit the right size to go with if I am installing this to my cannopy that fits the top of this tank? Any suggestion would really help, this is my first time doing something like this.
 
48" T5's are as close to the length of your tank as your going to find so I think 48" is good. I personally would trade the 400W ballast and bulb for a dual 250W MH setup. Dual 250's would cover the length of the tank better IMO.

Angela
 
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