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Gjengivelse av farger – MJwiki

Gjengivelse av farger

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Korrekt gjengivelse av farger er avhengig av en lyskildes CRI (color reendering index). En verdi på 100 angir at alle farger i spekteret kan gjengis korrekt. Glødelamper og halogenpærer har en CRI opp mot 100, mens selv de beste lysrør kun har CRI på 80.

En glødelampe har en fargetemperatur på 3200 Kelvin (K), noe som gir et varmt (gulig) lys. En gjenstand som belyses med en glødelampe vil beholde alle sine farger, men gjengivelsen blir forskjøvet i retning av gult.

Et lysrør har fargetemperatur på 2700 - 5000 K. Med et lysrør forskyves også fargeskalaen (i fht. K-verdien), men gjenstanden vil IKKE beholde sine farger. Dette skyldes at lyset som sendes ut fra lysrøret ikke inneholder hele spekteret.

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