An HPS is a HPS doesn't matter what purpose it's originally sold for they all grow the same. Take it out of its fixture and make a better reflector though... And if the bulb isn't new, replace it.
easy to use. i have a few 100 watt flood lights that are hps. they were simple i took extension cors and just put white to white green to green and black to black. and they work great. im not sure how energy efficiant they are though