Abstract: There is provided an electric current utilising facility conventionally connectable to an electric current supply outlet for causing the diversion of current along a desired circuit in response to manipulation of the facility. One embodiment of an electric current utilising facility is in the form of a re-usable light bulb (10). The bulb (10) comprises a circuit carrying device in the form of a globe (12) fitted with a number of independent filament circuits (14), and a circuit selecting mechanism providing a swivellable member firmly securable to a matchingly formed current supply outlet as provided by a sleeve (16) which snugly but freely swivellably in the direction of arrow (17) sits onto the stem (18) of the globe (12) while being retained against slipping owing to the stem (18) providing a ridge (20) on its socket engaging side. The sleeve (16) is fitted with pins (22) enabling the bayonet coupling engagement of the bulb (10) to a conventional light bulb socket outlet.