I have a fixture similar to this set up on my 10 gal. I just used a bathroom wall fixture which was extremely simple to wire up to a 8" wall plug. black to black, white to white (no ground). Here is a picture of the light output. (excuse the messy/dirty tank)
I am just using 3 15w 6500k bulbs with an "equal" out put of 160W but only uses 45w. The complete setup cost me maybe $35. After I started using this fixture, my coral got exceptionally healthier. Just don't burn your house down!!!