Headlamp bulbs more shock sensitive when hot?

[Tom Nas]

"TM" <t44tq at mindspring.com> wrote:

>Today I had one of my H4 80/100s go out on me, but I am
>not certain if this occurred before my car got slightly
>bumped in the parking lot or not.
>
>Are lightbulbs more shock-sensitive when they're hot?

Yes, they are. The wolfram wire is partially molten when in use, which 
makes it more fragile.
That's why licence plate lights keep blowing when you're in the habit of 
opening and closing your trunklid with the lights on.

Tom