I just got a 400 Watt Highbay MH lamp on ebay with an aluminum relfector for 55.xx bucks. Going to cut the reflector in half and weld it together to make a bowl shape, or get some sheet metal and make a reflector for it to grow my tomato plants. Even if the bulb that it comes with needs to be replaced (which most likely it will be due to age), figure a hundrend bucks for a 400 Watt MH set up is not bad.

You can go the same route with the HPS. Some Highbays are designed for HPS lamps, and you can get one for about the same. Or build your own. It's alot easier than you think.

Also like Snow Owl said, think about what a few oz of Tomatoes will cost you compared to a good light. I'm running a 1KW HPS that I picked up for 125 bucks on ebay. Plus have a spare 400W HPS incase the 1KW dies on me. Can't beat that with a stick, just have to watch the deals out there.

If your interested in building your own HPS unit, reply and I can help out with a design. Simple easy to find parts, CHEAP, and will reward you with bigger tomatoes.

Just found out my other 2 plants are female so now growing 4 females under 1KW. Happy, Happy, Happy!!