Quietly and efficiently power 400W metal halide and high pressure sodium lamps with a 400W ION Electronic Ballast. This versatile 120/240V workhorse features 250, 400 and Super Charge wattage settings for propagation applications as well as encouraging aggressive plant performance. Integrated circuit and thermal overload protections provide peace of mind while soft-start technology reduces lamp stress and ignition delay resolves spikes in power draw when firing multiple units simultaneously. Ballast is RF shielded, generator-ready and compatible with a multitude of reflectors and remote cord sets. Includes an 8’ 120V input power cord (240V cord sold separately) and full three-year warranty. Housing is 11.5”L x 4.5”W x 3.5”H, excluding removable handle.