That is a crazy closet space!! If using one plant, I do not see a problem. BUT That also depends on the strain you will be using. Though the HPS does raise up the temp and that is something to be concerned about (fire and a wilting/stressed out lady).

I have been nervous with heat and such so I started growing using CFLs (energy saving floros) with a lot of help from reading over these boards you could pull off a decent CFL grow with less money powering the HPS and with LST (low stress training) yield a decent amount.

So I think. Unless you bought the HPS already.

I would just still worry about vent for heat and smell. :hippy:

I'll subscribe and see what comes of it !