LuxStar T5 4' x 8 Bulb Fixture w Grow Bulbs b lite we discovered something special: On SNS SYSTEMICA 2.5GAL we discovered something special: On the EX600 and EX1000 DESIGNED TO WORK WITH B Lite Master Zone Controller (Not Included)FEATURESDimmable Settings (200W 350W 450W 660W)Advanced Dimmable feature with Use of External B Lite Master Zone Controller (1W 660W)Automatic Frequency AdjustmentFull Circuit ProtectionRF ShieldingTECHNICAL SPECIFICATIONSInput Voltage: 100V 277VACInput Power: 660WPower Factor: 120VAC Full Load =90%PPF: 1700 µmol sEfficacy: 2 LuxStar8 T5 Fluorescent Lights are 4 foot 8 light fixtures that are perfect space saving lights as they have a super low profile The LuxStar T5s use high efficiency digital ballasts and high output bulbs to create the most efficient light source