I need to replace the bulb in a bathroom light.

The problem is that I do not kow how to remove the bulb.

It is a cylindrical white glass piece about 40cm long and 3cm diameter attached to a plastic back which is fixed to the wall. The pull cord comes out of the plastic back.

Not knowing how the glass is attached to the back I don't want to pull too much in case I brake something.

It does not seem to be like shaver light, there are no contacts at the ends and there is not plasctic casing covering the bulb.

Perhaps this description is enough for someone to guide me. Otherwise, I will post a pic later.

Thanks,

Antonio