Halco Lighting Technologies 1383/CS B11CL3/827/LED 20W R12 SC Bayonet 13V CoverShield Incandescent Light Bulb 1, 500 - 6, 000 hours average rated life Sturdy C9 and c-9m staggered-mount filament for Rough/vibration service applications Silicone or high temperature pfa coatings are shatter- resistant and protect lamps from thermal shock