| About Ballast (MH or HPS) I want to know what is MH or HPS mean? when I went go to store today and Im curious looking around but I don't understand with stuff? what store have it: - HPS 400 Kit Basic - 1000 W Switchable MH or HPS 120 - 240 - HPS 400 Kit Wired - HPS 1000 Kit Bare Bones - Electronc 1000W HPS (Can ignite both MH and HPS lamps) - HPS 1000 W Ballast - HPS 600 W - MH 1000 Kit Wired - MH 1000 Bare Bones - MH 400 Kit Wired - MH 400 Bare Bones seem like 11 different Ballast but I don't understand with "MH" or "HPS" mean?  If I want less 40 grow then which one is best for me to get? |