Correct you are, but what happens to a fixture that is rated for
a 100 watt incandescent bulb when you use it for something other
than lighting? Are you saying that as long as you don't develop
100 watts of heat then the fixture will be just fine?

As long as you don't exceed the current and heat ratings, you'll
be fine.

So now you are bringing current into the equation. I'm glad the light
bulb turned on.