a nice design! lamp being vertical (up) and twist/lock photocell one 3/8 nut holds the cover shut , the seal is good so no bugs getting in, a walgreens in PA had these! the photo cell was instant response
LOL this is a GE PF-400 Powerflood turned upside-down with a drop glass lens added and a PC socket added where the knuckle slipfitter would normally go. Yeah GE makes some nice cobrahead-quality wallpacks.