Assertion: lamp's light | /r/HasProperty | switched
Facets:
Source sentences:
text: Nightlights are also useful to the general public by revealing the general layout of a room without requiring a major light to be switched on, for avoiding tripping over stairs, obstacles, or pets, or to mark an emergency exit.
text: If the light must be switched on and off frequently, Cold cathode CFLs can be used.
text: If the light must be switched on and off often, Cold cathode fluorescent lamps can be used.