> So does my red shirt, no? No, the light reflected by your red shirt is not like the light from the sun, because it is nowhere near the brightest object in vi

> So does my red shirt, no? No, the light reflected by your red shirt is not like the light from the sun, because it is nowhere near the brightest object in view. But you are right that if you made a lamp with the same spectral power distribution as light reflected by your red shirt but several orders of magnitude brighter, it would still probably be outside the range considered “white”, even after adaptation. > how they might be tweaked to be better for education. I think the current disposable cardboard ones which cost like 50¢ each (maybe less?) when bought in bulk are pretty good for education. If you walk around at night with diffraction grating glasses looking at different kinds of lamps, you can learn a lot about what kind of light they produce.