The large scale Light House Pole mount luminaire is your basic non-shielded lantern luminaire for maximum light distribution in all directions. Cast bronze cap and base and copper socket shield. Tempered, etched clear glass diffuser. PLT and MH models do not have integral ballasts and are intended for use with TTEKA PTR5 , PSR2 , or PSR3 series poles that are provided with ballasts. Slip fit depth of pole or post is 3'' and fits a 3'' O.D. pole top.