A lighting fixture comprising: a light source; a light source controller (110, 112) for controlling power to the light source; an external controller plug for connecting an external controller to the lighting fixture, a power input and a power return of the external controller plug for providing power from an external power source to the external controller, the lighting fixture being characterised in that it comprises: a power light source input of the external controller plug, with the power light source input being connected to the light source controller (110, 112) for selectively providing power from the external controller to the light source controller (110, 112) by controlling a switch connected between the power return and the power light source input, and a plug switch of the external controller plug, wherein the plug switch is connected between the power return and the power light source input and wherein the plug switch is arranged such that it engages a direct connection of the light source controller (110, 112) to the external power source, if the external controller is not plugged into the external controller plug, or disengages the direct connection of the light source controller (110, 112) to the external power source, wherein power from the external controller can be supplied via the power input and the power return, if the external controller is plugged into the external controller plug. a light source; a light source controller (110, 112) for controlling power to the light source; an external controller plug for connecting an external controller to the lighting fixture, a power input and a power return of the external controller plug for providing power from an external power source to the external controller, the lighting fixture being characterised in that it comprises: a power light source input of the external controller plug, with the power light source input being connected to the light source controller (110, 112) for selectively providing power from the external controller to the light source controller (110, 112) by controlling a switch connected between the power return and the power light source input, and a plug switch of the external controller plug, wherein the plug switch is connected between the power return and the power light source input and wherein the plug switch is arranged such that it engages a direct connection of the light source controller (110, 112) to the external power source, if the external controller is not plugged into the external controller plug, or disengages the direct connection of the light source controller (110, 112) to the external power source, wherein power from the external controller can be supplied via the power input and the power return, if the external controller is plugged into the external controller plug. a power light source input of the external controller plug, with the power light source input being connected to the light source controller (110, 112) for selectively providing power from the external controller to the light source controller (110, 112) by controlling a switch connected between the power return and the power light source input, and a plug switch of the external controller plug, wherein the plug switch is connected between the power return and the power light source input and wherein the plug switch is arranged such that it engages a direct connection of the light source controller (110, 112) to the external power source, if the external controller is not plugged into the external controller plug, or disengages the direct connection of the light source controller (110, 112) to the external power source, wherein power from the external controller can be supplied via the power input and the power return, if the external controller is plugged into the external controller plug.