> "how hot is this deal" (and thus red == best) If that's the intuition you want, then wouldn't it be natural to use the blackbody radiation spectrum (a.k.a. "

> "how hot is this deal" (and thus red == best) If that's the intuition you want, then wouldn't it be natural to use the blackbody radiation spectrum (a.k.a. "color temperature")? Red hot -> white hot -> blue hot.