Quote - > Quote - While that might be important in real life for biology, physics, etc..

It will not matter much when creating an image, you won't feel the heat, your leaves won't be synthesizing sunlight, you won't be imaging ultraviolet or infrared. ;)

So the equation will be close enough for image rendering.

It will depend on the physical properties of the object. For a silver mirror or a good quality crystal glass the image error will be insignificant, but if you deal with a plastic you are in trouble.
Of course for Poser or Vue users the error will be also not so important, after all we don't care too much with Phong that is physically wrong.

And the programmers will cross that bridge when they come to it. We aren't there yet. So let's just concentrate on what is rather than what isn't, yeah?

Laurie