I asked years ago. Starting out with photography, I was reading and reading and then looking at items, I worked in a retail chain that sold cameras and accessories, as well as photo processing.
One day, while visiting a photographer, studio photography, weddings, sports, I asked about light meters, used to measure the light.
First, was the reflective light meter, he said. It measures light that is present, overall.
Ah, got it, I said.
Then he said, the next is an incident light meter, he asked if I knew that was.
Well, no, not quite yet.
Sure thing, he said, it’s the kind of meter when you take it out to use it, it causes a riot.
Funny, funny, guy, he was.