10 NL plants

I'm going to be growing 10 Fem NL plants and just had a few questions

-I'm going to be using a 1000W light with a switchable ballast so I can run MH and HPS. Can 1000 Watts burn the plants?
-How long for veg and flowering?
-I don't want to kill the plants with fertilizer but would like to use some kind of grow enhancers. any suggestions?
-Also, what type of yield can I expect?

Thanks I really appreciate it!!!

Look in my Album at mY northern Lights, she poped up may 15th. Still vegging her because this last 2 weeks she really started looking good. You can see her week by week.
I use FF ocean forest soil, FF grow big, Extreme Serene, and Molases.