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Color Rendering Index

Color Rendering IndexNelson Opea

OutlineDefinition of Color Rendering IndexBenefits of high Color Rendering IndexSpectroradiometer Tests (Lab)Colorimeter Tests (On-site)Effects of CRI on colorsSummary

I. Definition of Color Rendering IndexColor Rendering Index-In general terms, CRI is a measure of a light source's ability to show object colors "realistically" or "naturally" compared to sunlight. CRI of the sun is 100.

II. Benefits of High Color Rendering IndexBetter color recognitionMore vibrant colorsClearer visionMore realistic colors

III. Spectroradiometer Tests (Lab)

Note: All lamps were stabilized for 15 minutes prior to testing.


IV. Colorimeter Tests (On-site)

A. LeedarsonB. FireflyC. Ellipz

Note: All measurements were taken directly below the lamp and beside the test object.


V. Effects of CRI on Colors

Disclaimer:-The pictures on the following slides were taken using Nikon DSLR D3000 with the same camera settings.-The on-site values of CRI were taken while capturing the pictures.-No lamp, box and camera movements were made while taking the pictures.

V. Effects of CRI on ColorsLeedarson, CRI = 72.52

Colors were pale.

V. Effects of CRI on ColorsB.Firefly, CRI = 84.23

Orange and yellow are still pale. Blue became darker.

V. Effects of CRI on ColorsC.Ellipz, CRI = 93.3

The colors became more vibrant.

VI. Summary

-LED Lamps with CRI>90 produce more vibrant and attractive colors than lamps with lower CRI.-Realistic object colors will be projected if the lamp has high CRI with color temperature that range from 5500 to 5700K, which is relative to the color temperature of the Sun.

CRI = 72.52CRI = 84.23CRI = 93.3