BA15s - Single Contact Candelabra Bayonet (or S.C.Bayonet) glass: T6 filament: CC6 fil.res.: 25 ohm m.o.l.: 1.97 inch (50MM) l.c.l.: 0.945 inch (24MM) burn pos: burn lamp in Base DOWN position only i.lumens: 500 cp: 40 cri: 99 color temp: 3100 d.hours: 30