a sufficient pulling force is applied to the cover to overcome the spring bias optional bores 31 and 54 may be included in the latch 30 and side portion 40 respectively for insertion of a conventional removable fastener 32 for example a locking screw pin or bolt to protect against vandalism or unauthorized opening of the enclosure in an alternate arrangement of the latch type retainer illustrated in fig1 a spring clip 152 with ridge 154 may be attached to the second side 150 of the frame so that it extends forward to cooperate with a ridge or slot 160 formed in an extension 162 on the end of the front cover 164 in this configuration the leading edge of extension 162 will cam the spring clip 152 outward until the ridge 154 on the spring clip snaps into slot 160 in the extension to releasably lock the cover in place in a second embodiment of the fixture shown in fig1 the same basic structure as described above is modified so that front cover 124 has a spring locking clip 130 formed at both ends of the cover thus in this embodiment the same type of retainer is used at both ends of the cover the spring locking clips 130 mate with corresponding slots or ridges formed in sides 140 and 144 of the frame for replacement of the lamp the entire front cover 124 may be pulled away from the frame by pulling one of the clips 130 away.