If anyone is getting nervous about keeping their plants over the winter, FarmTek is offering their high-output, full spectrum compact fluorescents at a discount right now - 150W (CRI 93, uses a standard medium Edison base) is $36, 200W (CRI 90, Mogul base) $110. They also have them available with a good reflector fixture that can accommodate either.
I use a single 150-watt fixture for a 4' x 5' seedling and flask bench in my basement, and it works great.