Thanks so much! One other question- do you think they'll be okay for a few hours until I can get home (or have I just inadvertently fried the tap root by exposing it to any light at all)?
I really hope not- I got all excited when they sprouted.
For background: I'm using a basic flourescent grow lamp- nothing fancy and it doesn't throw off much heat at all. It's about three inches away from the soil/exposed root. The soilless growing medium is nicely damp and has water retention crystals and they're in peat pots that are properly saturated.