... , give 22.3 watt to a 28w lamp tube 7) Voltage optional: 110v ,120v, 220v ,230v , 240v , 277v, and 347v 8 ... provide constant light output for mains voltage of 156-256VAC10) EOL ( end of life detection) it recognises end of lifetime and switches off lamp ... and electronics.11) Cut off technology:= intelligence that takes care of optimal energy-use and safety.12) Reflector optional : high parabolic ...