I tried three types I found at very good prices on Amazon. We have a Prime membership so we seldom pay shipping which makes small items even cheaper.
HQRP BA15S Bayonet Base LED bulb $12.95 at Amazon - Osprey-Talon
This produced the best light overall
BA15S 1156 3.6w Warm White 1419WW $18.49 at Amazon - Starpower
Too warm - more like 3200K tungsten lamp
LED S8 BA15S 16 SMD Warm White $8.59 at Amazon - Zitrades
Good white light
For general use the $8.59 ones are very good and for areas where I wanted as much light as possible I bought more of the $12.95 ones. All use the standard 1411 mount and are one piece units.