Note:
The article concludes that the cut-off is somewhere around 15min.
It is also based on 1988 research and applies to mostly to long tubes
not screw-in replacements, and an electrical cost of $.05/KWH. Also no
mention of replacement costs of the lamp and/or ballast.

A rough guess for modern balasts (especially cheapo screw-ins) and
higher costs would be 5 min. or less.
I recently saw the screw-in CFs for $.99 each, at that point I can
afford to loose a few!

Richard Reid, LC
Luminous Views

PS: Modern technology has a method for making virtually all light bulbs
last forever. A small device, when employed in the "off" position it
prevents normal failure.
;-)

Bill wrote:
Answer here...
http://www.lightingdesignlab.com/art...luorescent.htm


"LIKLIK" wrote in message
I Was told that it is cheaper to switch fluorescent lights on then
leave them on, than it is to keep switching them on and off, Can
anyone tell me if this is true or not?