出典:Wiktionary
出典:『Wiktionary』 (2026/03/03 22:53 UTC 版)
radiance (countable and uncountable, plural radiances)
出典:Wikipedia
出典:『Wikipedia』 (2011/05/03 15:17 UTC 版)
Radiance and spectral radiance are radiometric measures that describe the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle in a specified direction. They are used to characterize both emission from diffuse sources and reflection from diffuse surfaces. The SI unit of radiance is watts per steradian per square metre (W·sr−1·m−2).
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