You'll be OK, the lighting will all be pretty much the same for most strains. It's a rare plant that needs more than 12 hours dark. It'll be the nutrient and water schedule that'll be different.
I've got 8 strains growing now, under one 1000W HPS and some UVBs. Lighting is never a problem. You may have to put a bucket under the shorter plants to even up the canopy, or put the short strains in the middle with the taller ones making a coliseum around the outside so they get light on their side buds.
What strains are you looking at?
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