= International Lighting Vocabulary by CIE
{c}
{title2=2020}
https://cie.co.at/eilvterm/17-21-071
CIE S 017:2020, International Lighting Vocabulary, second edition, entry 17-21-071: local incident radiant energy per surface area, symbols and SI unit. Entry 17-21-054, https://www.cie.co.at/eilvterm/17-21-054 , defines spherical irradiance and its different angular geometry.
https://cie.co.at/eilvterm/17-21-041[Entry17-21-041: radiant energy, symbols, time integral of radiant flux and joule unit, notes1 and4]
https://cie.co.at/eilvterm/17-21-054[Entry17-21-054, note2: incident flux on a small sphere divided by its diametrical projected area; note5: watt per square metre]
https://cie.co.at/eilvterm/17-21-053[Entry17-21-053: irradiance as incident radiant flux per receiving-surface area, with watt-per-square-metre unit]
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