140 watt hps grow

whats good everyone. I'M just about to begin my second grow, after a relatively successful first grow. on the first one i used cfl's and decided that they just don't cut it, at least for the type of grow i'm interested in. So i decided to go with two 70 watt hps. My question is, could i support 10 healthy autoflowers under 140 watts or do i need more. Any comments would be much appreciated. Peace out.

Ideally, a 600w HPS would be perfect. A 400w would be sufficient. 140w in my opinion would just not provide enough light for 10 plants. 280w in a square might be good enough though.

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