JK> A member of my congregation says that it is cheaper to leave 
JK> a light on all day long than it is to turn it on and off 
JK> twice, whether florescent or incandescent.  Is this true? 
JK>  Can anyone point me to published information? 
I don't know about cost, but for incandescents, the bulb will last much
longer if left on, as opposed to constantly turning it on and off.  This
is caused by the temperature change expanding and contracting the filament,
making it brittle and shortening it's life.  Of course, the cost is very
relative to the price per kilowatt/hour, the cost of the light bulbs, and
the frequency & duration of switching it on and off.  Oh, how a geek like
myself can make a simple idea sound so complicated.
                                  -Tom
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