Yes your floro's can be used for the entire veg period with excellent results.

Make sure they have a kelvin temp of 6400 - 6500 and make sure they are true FULL SPECTRUM...not equivelents.

You can buy online from many places.

You will want about 125W per plant. Not cheap, but better for veggin that HPS.

Cheaper to run and less heat. Look for something like these.