different between exitance vs extance

English

exitance (plural exitances)

(physics) Flux (of radiation).
- 1984-7, John E. Kaufman, Jack F. Christensen, (Illuminating Engineering Society of North America), IES lighting handbook: Volume 1984:
  The entire east sky provided an equivalent exitance of 19 kilolumens per square meter (Method 1) […]

Latin extantia, exstantia (“a standing out”), from exstans, present participle. See extant.

extance (plural extances)

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