If you are going to buy off ebay buy something with guts:
http://cgi.ebay.com/48-Metal-Halide-...item2a05be8fc6

Thats a prety sweet light.
here is a nother one that is better than what you posted.

http://cgi.ebay.com/48-4-ft-Metal-Ha...item19bb047f2c

the better ones cost a bit more but they are worth it.

and if you just wanted T5's try this.

http://cgi.ebay.com/48-NovaExtreme-P...item414e16a502

Bill