... available:250W,400W,600W,1000W2.Rated input voltage and frequency:120/240V AC,50Hz-60Hz3.Working temperature ... 5Features:1. Operate both HPS and MH lamps 2. Offer high performance output and energy efficient 3. Great ... Short circuit protection,Open circuit protection,Overheat protection ,and Lamp failure protection 4.4 phase mannual dimming:110 ... warranty 6. UL approval 400W Dimmable Electronic Ballast