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 ...