LFUN
  protected void emit_light (int l)

DESCRIPTION
  Update this objects P_LIGHT level.

  Argument:
    l : the requested change of light.

  The function updates P_LIGHT and informs the environment by a call
  to its light_from_inside(<l>).

  Auxiliary function used to propagate light changes, like those
  caused by movements of lightsources. Don't call this manually.

IMPLEMENTED
  /std/thing/description