Seed Starting with Lights
I'm going to be growing seedlings indoors (I was given a bookshelf type greenhouse that has a plastic cover - widely available, about 2-2.5 feet wide). I'm going to be starting mostly tomato and pepper plants. Probably only 1 flat at any time. We might as well say they will get NO actual sunlight until they are being hardened off. I'm also considering growing lettuce inside in the heat of the summer and winter.
My budget is very small (otherwise I could just buy the plants instead of starting them). What's the minimum lighting I'm going to need? Can I get a one-bulb shop light from Lowes? A two-bulb? Will regular fluorescent bulbs work? If I buy a cheap shop light from Lowes, can I upgrade the bulbs to "grow lights" later but still use the fixture? (I know T5, T8, T12 is the size of the bulb and I'd have to keep that consistent)