1.4 phase mannual dimming:110%,100%,75%,50%. 2.Output power: 600W 750W 1000W ... crest factor<1.5Features:1. Operate both HPS and MH lamps 2. Offer high performance output and energy efficient 3. Great ... ,Overheat protection ,and Lamp failure protection 4.4 phase mannual dimming:110%,100%,75%,50%. 5. 3 years warranty 6. UL ...