The question of whether or not, when you see something, you see only the light, or you see the thing you’re looking at, is one of those don’t-be-philosophical things that an ordinary person has no difficulty with.  Even the most profound philosopher, sitting eating his dinner, has many difficulties.  What he looks at perhaps might be only the light from the steak, but it still implies the existence of the steak, which he’s able to lift by the fork to his mouth.  Philosophers that were unable to make that analysis of that idea have fallen by the wayside to hunger.