you are gonna run into height issues.
The light is enough, consider adding some flouros.

You will have to flower (12/12) after about 12" or less depending on the strain.
Grow a mom, cut some clones, SOG 20 plants in that same area in 6" pots. That would maximixe your space and limited height.

Just my 2 cents.
blink_inc Reviewed by blink_inc on . 150 watt HPS will one 150 watt HPS be enough light for 2 plants the grow area is is 3' by 3' by 3' Rating: 5