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 (D); 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 , 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 (D) 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 , 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 (D); 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 , 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 (D) 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 (D) 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 , is otherwise selected from said first group. <EOS>