Responsibility for lighting on common property

Who is responsible for changing a light bulb if the light is on a walkway that is common property of the body corporate?

   I asked the building manager/caretaker to change the light bulb outside my front door, but was told that “the strata manager had advised him that I, the owner, was responsible because the light switch operating the light was inside my unit”.

  Can anybody clarify this for me?    

BombThrower