I haven't read all the posts, so sorry If I repeat stuff.
In your space you would need to invest in a ventilation system to use an HPS bulb.
Even with CFls you will need some ventilation, though this could be just passive in the form of holes 9Inch or more drilled into the back of your cupboard/wardrobe/closet.
I tried to make a veg box that was 18"x18"x24" with 4x21w cfls. I din't ventilate it and acheived temps of 65C. Needless to say, thats hotter than a desert, so nothing grew in there.
I use a 250w envirolite, but multiple light sources can be wrapped around the plant and you will get less lumen drop off, as each bulb could be an inch away friom buds.
Hope this makes sense.
JM