Standard candelabra size bulbs. I believe that's e12. We have the same coach. I replaced the 3 sconce bulbs with some led bulbs Costco had . Just make sure they are dimmable and even at that, they will flicker at times if not on full.ive tried several brands and found the same results. The light bars Over the 2 bath sinks I have not replaced as they are clear "round" exposed bulbs (the same e12 candelabra base also) and I haven't found any leds that look good with the right color temp.