While it might seem astonishing that so many longest-lasting light bulbs have been so infrequently turned off, this is the precise reason for their longevity. Most of the wear and tear that leads to burnouts in incandescent light bulbs is caused by turning them on and off, not by burning them. Each time the bulb is turned on and off, the filament is heated and cooled. This causes the material of the filament to expand and contract, in turn causing tiny stress cracks to develop. The more the light is turned on and off, the larger these cracks grow, until eventually the filament breaks at some point, causing the light to burn out.
[^] # Re: Dommage
Posté par Frank-N-Furter . En réponse à la dépêche Nouveau Linutop OS basé sous Ubuntu Lucid. Évalué à 1.
http://en.wikipedia.org/wiki/Longest-lasting_light_bulbs
Depending on the time of day, the French go either way.