I need some help with selecting the right light for my new 155 gallon bow front tank. I currently have a 46 gallon tank with a 36 inch 2x39 watt t5h0, I was thinking about getting another one to match this one. Then I would have 2x  36 inch light at 2x39 watts this would be a combined wattage of 156 watts for the 155 gallon. So about 1 watt per gallon, seems kinda low. I use dry ferts along with pressurized c02 (5 lb tank). I need 6 feet of lighting but am afraid to spend the big bucks on it. I have seen 6 foot fixtures as high as 550 bucks. Please help me so that I may set my tank up ASAP.

http://www.amazon.com/Nova-Extreme-T...+extreme+t5+36

that is the one I have now, I found one on CL for 40 dollars.