I made the mistake of trying to grow with 2 duel 40 watt 4 foot fixtures. Two months later I could see they weren't growing very well so I got 2 - 175 watt mercury fixtures. They helped, but still not good enough. After 4 months of growing I broke down and bought one 400 watt HPS. At 7 months I had 2 of 5 plants go hermi on me.

In all my reading etc. I've come to understand growing plants is very much like growing a human! When people grow up in freaky environments with poor eating, sleeping habbits, they don't do as well as if they were better taken care of.

Now my second grow has two 400 hps fixtures. HOLY COW! What a freaking difference. In 9 weeks my plants are 3 feet high by almost 3 feet wide with no topping!

Good luck, but I believe you would do best by waiting until you can set it up right. Electricity is getting expensive and you don't want all that money wasted on crap for herb.