UV-C Germicidal 254nm U-shape 50mm Miniature Cold Cathode Lamp w/Quarts Sleeve 12V DC Kit Water & Air Purification Lamp Spec: Starting Voltage: 380V ; Lamp Current: 5.0mA + - 1mA Energy output @ 254nm: min 5mW/cm2 (at the surface of the lamp) Discharge stabilization time: 3 minutes ; Typical Life Hours: min 5,000 The inverter is designed to supply the Lamp with correct voltage First, it will supply a starting voltage up to 900-950 vrms. Then the voltage will drop supplying the lamp a constant current of 4-9 mA at 40-50 KHz.