21.   Who turned the light out?

22.   Turn your light on Michael.

23.   Can we turn that light off please?

24.   She said it was just wonderful not having anybody shouting at her to turn the light off.

25.   And Allen stood, stretched, turning the lights on one by one.

26.   A few paintings are executed on a photo-refractive fabric that turns ambient light into a prismatic sheen, a magically tawdry effect.

27.   A light sensor turns the light on at dusk and off at dawn.

28.   A motion-sensor fixture turns the light on when it detects motion nearby, such as an intruder approaching the porch.

29.   All areas are continuously lit by fluorescent lights, except the bedrooms, where the lights can be turned off but the people will still be visible.

30.   Also available are timer-sensors that turn lights on at dusk and turn them off again at dawn or at whatever time you decide.