being interconnected by an intermediate tubular shoulder 38 upon mounting of the rear lens element 14 and lens cover element 16 the shoulders 38 lie in flush relationship against the surface of the panel 20 and the reduced diameter portions 34 are received within the orifices 30 each tubular projection 32 therefore defines a bore for receiving a mounting fastener 42 which secures the lens cover element 16 to the housing 12 the lens element 14 has four corner openings 56 which are dimensioned to closely receive the tubular projections 32 of the lens cover in addition the lens element 14 has two spaced shutter openings 58 which generally axially align with the lamps 28 to allow direct axial radiation from the lamps to traverse generally unimpeded through the lens element 14 the lens cover 16 has a convex smooth face 60 and a substantially rounded rectangular shoulder 62 which is provided with a rear axially extending lip 64 the lip 64 cooperates with the shoulder 62 to define a peripheral recess 66 the recess 66 receives a complementary peripheral lip 68 provided on the flange panel 20 of the reflector housing 12 to affix the lens cover 16 and the lens element 14 onto the housing it should be appreciated that the lens element 14 is dimensioned to be closely received by the lens cover and may be secured therewith by means of hot melt glue affixed at locations 70 illustrated in the drawings as an alternative to the use of glue mechanical fasteners can be employed to secure the lens element 14.