600-Watt HPS Grow Light System with 42 in. Parabolic Vertical Umbrella Hood ReflectorThe Hydro Crunch Grow Light System combines our digital ballast which is UL listed and has the ability to dim 600 Watt, 400 Watt, 250 Watt and also has a super lumen enhanced setting to maximize the grow light systems output. Digital ballasted lighting systems generate roughly 30% more PAR (photo synthetically active radiation) for every watt of electricity consumed compared to the magnetic (core and coil) ballasts of the past. Digital ballasts are