Miniature lighting apparatus

摘要: A lamp unit having an electromechanical ball including first and second electrically-conductive hemispheres separated by insulator region, the being pop-fit insertable removable anywhere along a guide track apparatus providing oppositely-disposed conductor strips, rotatable with respect to strips provide on-off switching. The unit-track combination provides multiple capabilities of aiming switching, as well insertion removal, while eliminating conventional fixturing.