On Sun, 11 Jan 2009 07:38:44 -0600, Mark Lloyd
wrote:

On Sat, 10 Jan 2009 20:33:19 -0500, wrote:


Worse than that. AC incandescent lamps acturally turn on and off
60 times a second. :-)

It's 120 times a second (there's a zero-crossing after EACH
half-cycle), and power doesn't stay off very long. Probably not long
enough for the filament to cool and cause thermal stress.

Your right. I am glad I was not taking a test. :-)