An adaptor (50) for connecting an LED lighting unit to a vehicle CAN-bus. The adaptor has a connector (52) connectable to a corresponding connector on a vehicle, to receive a lighting current from a CAN-bus of the vehicle. A wireless power transmitter (54) of the adaptor (50) wirelessly transmits power to an LED lighting unit at a first level, typically suited to LED operation. The adaptor (50) further includes one or more resistors (60) connected between the connector (52) and transmitter (54) and arranged to draw power from the connector (52) at a second power level higher than the first power level, which second power level is suitably equivalent to that for halogen or filament lighting.
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