metal halide is better for veg, and high pressure sodium for bloom. so it would be best to get a dual ballast and run both. or you can get a few more CFLs and use those for veg and get just the HPS for flower.

keep in mind that your plants will grow by 1/2 to 2/3 when you put them in bloom, strain dependent obviously. never grown silver haze so i don't know. i think you are gonna run out of room quick with trying to grow that many plants in that space. you might try a SOG or ScROG.

if you go with the SOG you can get a perpetual harvest with the independent veg/flower rooms.

just my two cents.

-shake