Mythbusters, a great show, tested this myth. Fairly scientific with a 
variety of bulbs including fluorescent, LED and incandescent to see 
if it was more efficient to leave on than turn on and off every time 
you need light. Their conclusion was that it is more efficient to 
turn on and off (regardless of the amount of time you might not be in 
the room) than to leave it on.

They also tested the length of time the light source lasted. 
Incandescents least, flourescents next and the LEDs they gave up on 
because they could not wait till they died.


>A related query: I was always told that fluorescent lights should be 
>left on all day, because they take a lot of energy to turn on. So, 
>if you're turning them on and off all day when you're entering & 
>leaving the room, aren't you negating any energy savings you might 
>have gained by substituting them for incandescents? IF true, doesn't 
>the same principle apply for the compact fluorescents, too?

-- 
Albert Sperath, Director

Mail address
University Museum and Historic Houses
The University of Mississippi
PO Box 1848
University MS 38677

662.915.7073
662.915.7035 FAX

Physical address
University Ave. and Fifth Street
Oxford MS 38655

http://www.olemiss.edu/depts/u_museum/


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this communication in error, please contact Albert Sperath.

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