For those wanting to look at a nice review article on radiative cooling:
"Radiative heating and cooling with spectrally selective surfaces"
C. G. Granqvist, Applied Optics, volume 20, no. 15, August 1, 1981, p.
2606-2615.
"Considering radiation balance only, such an ideal surface would be able to
reach a minimum temperature lying ~50C below that of ambient."
Larry Woolf
General Atomics
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