What is a mv 175 light? Is that mercury vapor? If it is mercury vapor, my understanding is that is not a good light spectrum for growing at all. You'll do much better with a single 250w or 400w HID metal halide (for veg) or HPS (for flowering) light. I've even seen great results here from people just using a handful of cfl's.

As to your current setup, I'm no expert but would have to say, no, that's not enough light.