If what you are after is lighting related but doesn't include the light source itself, chances are, you'll find it here. This includes CANbus adaptors and load resistors needed when upgrading your standard halogens to more efficient LED alternatives, dash switches for neatly adding auxiliary switchgear without ruining the factory aesthetic of your dash, plugs and leads or globe holders and sockets for repairing your factory wiring loom or adapting it to suit different light fittings, HID ballasts for driving your Xenon headlights, light covers and lenses and housings, mounts and clamps.
Those after more universal gear to help with their lighting installation, such as wire and cable, fuses and circuit breakers, power distribution and junction boxes, terminals and connectors, heatshrink, cable ties and conduit or similar, should peruse our wiring and connections category.