The LH0166 HH-1-811H tombstone lamp holder is a non-shunted, plunger (male) end, push fit LED or fluorescent HO, VHO lamp holder. The LH0166 fits RDC R17d lamp bases and has ratings of 660w - 600v for HO fluorescent and LED lamps. It is made of thermoplastic and is cULus certified. It is typically used in commercial and industrial lighting applications. The LH0166 HH-1-811H is similar or equal To: American DeRosa: D3943, DM Technology: DM38-20, 85520, HH Fluorescent: 1-811H, Satco: 80-1498 and Supermarket Parts Warehouse: FR5-205
Also, see matching stationary end LH0165
Link to HO , T10 1500mA, T12 VHO, lamps that fit this socket