Turning off lights - times
Incandescent lights: Turn off whenever you leave a room.
Compact fluorescents: Turn off if they will be off 5 minutes or longer
Fluorescent lights: Turn off if they will be off 15 minutes or longer
According to the U.S.
Department of Energy, incandescent lights should be turned off whenever
you leave a room. For fluorescent lights, generally they should be
turned off if you are going to be leaving a room 15 minutes or longer,
otherwise they can be left on. For more information: