I have bought candelabra based 12v bulbs from several websites. just do a google search. be aware though, that 6-12 or more 40 watt 12 volt bulbs in a candelabra fixture can get you to a lot of amps in a hurry. I am guessing most 120v fixtures are not wired with that many amps in mind. most 120v fixtures have 16 guage wire or thinner inside. lots of amps makes wire hot and dangerous. be careful and do the math before you do this.