The lampshade is compatible with E14 sockets, but it is also marked E27 because it can be adapted to both types of socket depending on the support used. However, the diameters of E14 and E27 sockets are different, so you need to check that the lampshade is mounted on a support or lamp that accepts the socket corresponding to your bulb. In general, the lampshade can be mounted on brackets with E14 or E27 sockets, but the socket itself must match the bulb used.