Just over 2 feet of height? that's gonna be very very tight. you'll probably want to look into LST or SOG to maximize your vertical limits.

check out HTG's little T5 lamp...2 bulbs, 10,000 lumens...$70...
High Tech Garden Supply

I'd do 1 of those in your veg and 2 of them in your flower. that'd probably max you out as far as space is concerned and with very little heat.

Some reading:

SOG: Marijuana Sea of Green Method - Concept420 - Marijuana Entertainment and Information

LST: How-To : LST (Low Stress Training) - Grasscity.com Forums

good luck.
Skeet.