housing 12 as well as at the junction between the head assembly 14 and the housing 12 turning now to fig4 another important and unique feature of the receiver sleeve 20 is illustrated as was described above the tail portion 24 of the receiver sleeve 20 captures the optical portion 32 of the lighting element 30 and centers it in the center of the aperture 26 in this manner the optical axis of the lighting element 30 is centered along the central axis 28 of the receiver sleeve 20 the interior surfaces of the receiver sleeve 20 including the interior surface of the rear wall 22 and the interior wall of the tail portion 24 are all coated with a non reflective coating 64 preferably the interior surfaces are coated with a flat black non reflective coating 64 when looking into the end of the receiver sleeve 20 with the lighting element 30 installed it can be seen that a black non reflective field is provided around the optical end 32 of the lighting element 30 light emitted from the lighting element 30 fully illuminates the aperture 26 area while a dark non illuminated shoulder can be seen at back wall 22 of the receiver sleeve 20 adjacent the aperture 26 this forms a high level of contrast between the illuminated aperture 26 and the non illuminated back wall 22 the use of the coating 64 is counter intuitive to the prior art type devices in the present invention it prevents stray light from being redirected onto the face of the rear wall 22 and maintains the high level of contrast between the aperture 26 and the face of the adjacent rear wall 22 an optical lens 66 is coupled to the end of the.