An electric lamp, comprising: a housing; a light transmissive cover on a front of the housing which with the housing forms an interior space; at least one light emitter in the interior space, wherein light from the emitter is transmissible through the cover in a forward direction; a first mount receptacle adapted for receiving a first mount to hold the lamp; a second mount receptacle, separate from said first mount receptacle, said second mount receptacle adapted for receiving a second mount which is shaped differently than said first mount, to hold the lamp; and a third mount receptacle, separate from said first and second mount receptacles (121, 131), said third mount receptacle adapted for receiving a third mount which is different than said first and second mounts, to hold the lamp; wherein: (a) said first mount receptacle is selected from a first group consisting of: (i) a pair of coaxial threaded members on opposite sides of said housing; (ii) an aperture generally transverse to said forward direction of the lamp, said generally transverse aperture being through at least a portion of said housing and adapted to receive a shank therethrough; and, (iii) at least two holes in said housing, said cover, or both, with said holes being oriented generally parallel to said forward direction of the lamp and adapted to receive two respective fasteners for face-mounting the lamp; (b) said second mount receptacle, which is different from said first mount receptacle, is otherwise selected from said first group; and (c) said third mount receptacle, which is different from said first and second mount receptacles (121, 131), is otherwise selected from said first group. a housing; a light transmissive cover on a front of the housing which with the housing forms an interior space; at least one light emitter in the interior space, wherein light from the emitter is transmissible through the cover in a forward direction; a first mount receptacle adapted for receiving a first mount to hold the lamp; a second mount receptacle, separate from said first mount receptacle, said second mount receptacle adapted for receiving a second mount which is shaped differently than said first mount, to hold the lamp; and a third mount receptacle, separate from said first and second mount receptacles (121, 131), said third mount receptacle adapted for receiving a third mount which is different than said first and second mounts, to hold the lamp; (a) said first mount receptacle is selected from a first group consisting of: (i) a pair of coaxial threaded members on opposite sides of said housing; (ii) an aperture generally transverse to said forward direction of the lamp, said generally transverse aperture being through at least a portion of said housing and adapted to receive a shank therethrough; and, (iii) at least two holes in said housing, said cover, or both, with said holes being oriented generally parallel to said forward direction of the lamp and adapted to receive two respective fasteners for face-mounting the lamp; (i) a pair of coaxial threaded members on opposite sides of said housing; (ii) an aperture generally transverse to said forward direction of the lamp, said generally transverse aperture being through at least a portion of said housing and adapted to receive a shank therethrough; and, (iii) at least two holes in said housing, said cover, or both, with said holes being oriented generally parallel to said forward direction of the lamp and adapted to receive two respective fasteners for face-mounting the lamp; (b) said second mount receptacle, which is different from said first mount receptacle, is otherwise selected from said first group; and (c) said third mount receptacle, which is different from said first and second mount receptacles (121, 131), is otherwise selected from said first group.