I think he meant that 2 things having the same colour, but different spectrum, can have different effects on your vision (and body?). The example that most easi

I think he meant that 2 things having the same colour, but different spectrum, can have different effects on your vision (and body?). The example that most easily comes to my mind is a LED screen representing a yellow colour, versus a lemon under the sun. Shame he didn't elaborate, it seemed to be an interesting topic.