It's a magnetic HPS ballast, that has a UL and ANSI rating....:thumbsup:..its better than digital ballasts, which are unsafe IMO.

It comes with a MH conversion bulb, that you would use first for vegging. The HPS bulb would used for flowering.

There might be a problem with reflector fitting inside the closet, if you needed to close it all the way.

I use a 400HPS in my closet too, about the same size. You HAVE to have a system of cool air in, warm exhausted out.

Some strains stink worst than others. My WW's stink to high heaven. Enjoy.