On 1/4/2015 7:37 PM, Jeff Liebermann wrote:

100 watt incandescent bulb on a desk lamp? Doesn't that get rather
warm and possibly hot enough to shorten the life of the bulb?

By how much?
What's the added surface temperature?
Add that to the filament temperature.
What's the percentage increase in filament temperature?

More likely, it shortens the life of the phenolic socket and switch.