... 1000W Dimmable E- ballastTechnical information 1.Other power also available:250W,400W,600W,1000W2.Rated input voltage and frequency:120/240V ... :>0.995.Current crest factor<1.5Features:1. Operate both HPS and MH lamps 2. Offer high performance output and energy ... ,and Lamp failure protection 4.4 phase mannual dimming:110%,100%,75%,50%. 5. 3 years warranty 6. UL approval. Dimmable Electronic Ballast