*Picture on the right with LED bulb, left with halogen bulb.
I use LED 4W(25W Equivalent) Deco (E12) Dimmable, Soft White light bulbs. They get barely warm, can touch it with bare hand, so safe to use.
I also use halogen light bulbs G4 12V 20W. Which shows lamps design really clear on the wall. Although it is very small bulb, it does get very hot therefore I only use it for displaying my pictures and upon request from customer who specifically asks.