The filament is made with stronger, more durable metal, and they are charged with a different kind of gas.Yeah, I know....why don't they make house light bulbs the same way........who knows???
To show how tough they are, I used to have a pickup light that I could work by giving it a light bump with my hand, and it would work until the next time I needed to drive with the lights on. I thought I had a bad connection, but when I told my mechanic about it, he said this was a common occurrence. The filament was actually broken, and tapping it with my hand while the electricity was on would cause the broken ends to "re-weld" themselves--when they cooled after use they would separate again. What a tough bulb!!
I have found bulbs operating with direct current as apposed to AC last longer.
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