Quote - What is this using a light like a camera?  Can I look through the light?  I can watch the scene while I rotate the light around to see where it goes.  Is that what you mean?  I wish the lights were selectable from the scene tree  when I am in lighting and render mode.

Yeah, you can switch your viewport to see the scene from the view of a light. As you move around the viewport, the light moves w/ the view, just as if it were a camera. It's really nice when you have a spot w/ 'point at' turned on. Makes it easy to place spotlights.

Friends don't let friends use booleans.