*Attention:* The IES website is still undergoing updates. We will send out an email once all systems have been restored. We apologize for the inconvenience and appreciate your patience. Before signing in, Please click here to confirm your password.

DonateJoinSign In

contrast rendition factor, CRF

[5.9.19.2]

The ratio of visual task contrast with a given lighting environment to the contrast with sphere illumination.

This term is obsolete.

NOTE: This definition was changed in ANSI/IES RP-16-17 Addendum 4.

« Back to Definitions Index