Here are other links showing a comparison of lighting outputs between T5HO and Metal Halides, with some pricing for 2-lamp and 4-lamp fixtures, with the lamps included. Need to consider the $300 minimum purchase and the shipping costs from PA. So, check with your local lighting stores for pricing and compare.
The T5 Fluorescent Lamp: Coming on Strong
http://www.seattle.gov/light/conserv...s/cv4_t5hO.pdf