Originally Posted by
Justloadit
I say that it is temperature, especially with incandescence. The fact that the globe is designed to run at about 180 degrees, it still relies on the ambient to keep the globe cool. Remember that the filament is being driven hard to be able to light up with the current flow, and it too has a maximum operating temperature before metal fatigue plays a roll in its destruction.
There is also the number of switch on times to contend with. Being a mechanical device to create light, the cold resistance causing fatigue, and the mechanical 50Hz shock of every time being switched on probably all contributes to the demise.
How many times have you heard the globe element pop at switch on when it fails.
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