Valgustustihedus on suurus, mis näitab, kui palju langev valgus pinda valgustab, lainepikkusega kaalutud heledusfunktsiooniga, mis on korrelatsioonis inimese heleduse tajumisega.
Illuminance is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception.
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