a really easy thing to do is...
using flouro's for the first 7 days run a 24/0 light schedule this will get them up out of the soil faster. after the 7 days change your light schedule to 20/4 for another 7 days. this will help to promote the growth of the plants first maybe even second set of sun leaves. after those 7 days are up, change your light schedule to 18/6 for the rest of your veg cycle. once you hit the 18/6 schedule your plants will explode with height and new growth between stem, roots, stem and branches.