Lew Hodgett wrote:
"J. Clarke" wrote:
If you have visions of becoming an electrical engineer, don't quit
your day
job.

For a resistive load P=E^2/R. If the lamp is rated for 100 watts at
130
volts then it will dissipate (120^2/130^2)*100 watts at 120v or
about 85
watts if its resistance remains constant.
---------------------------------------------
Review lamp data found in any lamp catalog.

The proof is left to the student.

Proof? This is high school physics.

If you disagree please be kind enough to show us some support instead of
some vague "review a lamp catalog".