should I be using the 250 watt light for the vegetative phase

[Daddyo]

How's it going, Ron? Listen, I just bought a hydroponics system (250 watt MH) and have a nice a little variety of sprouts. I have already transferred the sprouts (4 leaves - 2 of which are spiked) in their rock wool starter block into the aggregate, lava rock. My question is, should I be using the 250 watt light for the vegetative phase or would fluorescents work just as well? And how far should they be away? I am also running the solution 3 times a day, at 8 hour intervals.
Thanks,
Daddyo