...would have to have a bit more info to answer your question properly.

How many plants, and how much square footage are you trying to cover with the 4 CFLs and 70w HPS?

Without more info, I'd hazard a guess that your light levels are ok for the first bit o' vegging, but you will prolly need some more "oomph" for going to flower.

Rusty's right (of course) about the stretching...