... No.:J1000 1000W 120V-240Vauto voltage: 1. 120v,208v,240v 2. 208v 240v,277vsingle voltage:120v,208v,230v,240v and 277vsingle ... HPS or single MH(standard commercial version)HPS/MH swichable(greenhouse and hydroponic version)dimming function optional ... free50-60HZworking temperature from -25°c to 40°c HPS/MH 600W electronic ballast