Gratuitous Domestic Posting (TM) - Gardening Division

What better way to spend Boxing Day than to finally clean out my workshop and re-rig my indoor nursery? [Insert your own marijuana joke here.] The solstice is over - it's time to start thinking Spring.

My seed-starting station consists of half a dozen flourescent light fixtures hung from the rafters low over a wooden table. I've got the lights on a series of chains and beams that lets me lift or lower them altogether as appropriate. This year, I'm thinking about increasing the overall radiance a bit by putting some tinfoil around the sides of the table.

I don't have any kind of soil-heating system and have always wondered whether I should. The workshop isn't heated, but it is in the basement and pretty well insulated. And the lights throw off a modest amount of heat. In general, the lack of a heater doesn't seem to have had much of an effect in past years, but I wonder if I'm missing out on something. Do any of you gardening types out there use such a system? What do you think of it? Any observations or recommendations would be most appreciated.