LOGISYS Computer CLK4RD2 4 Dual Red Cold Cathode Kit Specifications: Tube diameter: 3.0mm Input voltage of inverter: 12v Output voltage of inverter: 680v Current draw: 5.0mAv Brightness: 28,000~30,000 cd/m² Lifetime: 30,000 hours Parts: 90 days limited Labor: 90 days limited