Emitted radiance of 1400 K lava at intensity 1, scene units against a noon sun of intensity 3: ~6× sunlit rock of
albedo 0.2. Physically about 2–4× (luminous efficacy of a 1400 K blackbody ~0.1–0.3 lm/W); a little more, as
photographs expose for the incandescence, but kept where AgX leaves it orange rather than pastel (bloom adds the glare).
Emitted radiance of 1400 K lava at
intensity1, scene units against a noon sun of intensity 3: ~6× sunlit rock of albedo 0.2. Physically about 2–4× (luminous efficacy of a 1400 K blackbody ~0.1–0.3 lm/W); a little more, as photographs expose for the incandescence, but kept where AgX leaves it orange rather than pastel (bloom adds the glare).