also, check out htgsupply.com for lights. I've heard the insidesun ones run really hot.

You can get hps security lights at most hardware stores for a lot less than $100. These are 60-150 watts and would be a better option for a single plant. A 250-watt lamp is more suited for 3-4 plants.

I think you'd be better off with a 400-watt lamp though. Not only are they about the same price as 250s, but you can grow more weed and there are better horticultural bulbs available for 400-watt systems.