Osram DULUX T/E are energy efficient fluorescent lamps with separate power supply. These lamps must be used with a ferromagnetic ballast and have 4 pin sockets. Each compact fluorescent lamp of this range has a base type GX24q-4 with 4 metal pins. Osram DULUX T/E 42W/840 PLUS GX24q-4 Lumilux Cool Whitelamps have a size of 16.9 cm. With a colour temperature of 4000K, Osram DULUX T/E 42W/840 PLUS GX24q-4 Lumilux Cool White will provide a cool white light.