wow. is the soil drying out every day??
I wouldn't water them unless the top layer plus an inch or two under the top layer of the soil.. is dry.
you'll end up over watering your plants man. It's not a good thing.. at all.
Secondly, with new young sprouts.. until they get about 2 weeks old they're better off left under flourescent or cfl lighting... let them get a little stronger and used to light before putting them under HPS or MH lights.
I would also advise you to read man.. doesn't sound like you've done much research about growing.
good luck.. but remember what I said. Go out there and read... read read READ! until your eyes go crossed.. ppl around here aren't going to just tell you every step along the way.
peace and good luck to ya's.