I think I know what you are talking about but $15 is just for a 70w HPS bulb, you need and socket and a ballast that are made for these types of bulbs .
Most people that buy their stuff from lowes buys the $50 floodlight that has a 70w HPS or you can go $80 for the 150w HPS floodlight. The Floodlights have the right socket and the right ballast that light these diff bulbs .
BLaQLiGhT Reviewed by BLaQLiGhT on . my ghetto grow well here are some pics of what i have.....enjoy:thumbsup: 1 2 and 3 are my girls 4 and 5 are my super ghetto carbon filter.....all it is is a fan taped to a package of fish tank carbon that i poked a shitload of holes into.works though i just dont know how long the fan will last Rating: 5