Luminaire with transmitter to transmit parameters relating to the luminaire

A luminaire 1 comprising a transmitter for transmitting to an external data storage device 3 a signal representative of one or more parameters of or relating to the luminaire. The luminaire may further comprise a memory 21 for storing the one or more parameters and there may be means for reading the one or more parameters from the external data storage device for storage in the memory. The luminaire may comprise means for receiving power from a mains power supply and a battery backup comprising one or more rechargeable batteries 26, 27, 28. The luminaire may be an emergency lighting luminaire, wherein transmitting parameters relating to the luminaire facilitates servicing. The parameters may include the voltage of the batteries, the capacity of the batteries, the number of activations of the luminaire, the last inspection date and the last measured luminance of the lamp.