Yes and yes. Brightness in any given wavelength range increases as the temperature increases. A white-hot surface is emitting more red light than a red-hot surface.
Thanks! I’ve wondered that for a long time.
I walked past some glass-blowing furnaces at Harbourfront today, and their working chambers were glowing a gorgeous, captivating, yet somehow also frightening, yellow. I thought of this thread.
I thought about this some more, and I was wondering why incadescent globes have a radiation distribution which, if not blackbody, certainly looks similar.
I realized is that metals are broad-band emitters and absorbers. Which lead me wonder what the emission spectrum of crystaline salt is? I suspect that it may be different from the flame emission spectrum, but I don’t know. Anyway, while looking around, I found that the National Bureau of Standards (now NIST) had considered the question:
Selective Radiation from Various Solids
http://nvlpubs.nist.gov/nistpubs/bulletin/05/nbsbulletinv5n2p159_A2b.pdf
and
http://nvlpubs.nist.gov/nistpubs/bulletin/07/nbsbulletinv7n2p243_A2b.pdf
Selective Radiation from Various Substances.
and also google specifically found lots of stuff about the emmission spectrum of the materials of lantern mantles