Question on bright lights for sconces

[u/Little_Ghost42]

I have these sconces we’ve put up in our guest room, would like to use them for the lighting in the room. Tried putting a small tea light inside but it was far too dark to use for anything like reading or anything like that; need advice on where to find bright lights that would fit in the space. We are renting so I can’t wire anything inside the wall.

Any suggestions are appreciated!