kpmarine
Well-Known Member
555 nm... But red light has the most photons.
It's not about what has the most photons, visibility is determined by how well the cones in your eyes pick up photons of a specific frequency. IR and UV are made up of photons as well, and no matter how much IR radiation is present in an area, you still can't "see" them without some kind of an instrument designed to convert them to something you can actually see.