A lighting device includes a support and an arm which is mountable on the support in a selected orientation for movement relative thereto. The arm has a channel extending at least partially along the length of the arm. A light source is mounted on the arm. A first electrical connector is mounted on the support, and a second electrical connector is mounted on the arm. The second electrical connector is detachably electrically connected to the first electrical connector, and is moveable along the channel with lengthwise movement of the arm relative to the support.