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Color rendering index (CRI)<br />
• A measure of how good the light source can render the real colors of the<br />
illuminated objects<br />
• Maximum value is 100, minimum value is ‐100<br />
• Developed by International Commission on Illumination (CIE)<br />
• The calculation is based on<br />
� The reflection of the test light from test samples<br />
�� Th The reflection fl ti of f the th reference f light li ht from f test t tsamples l<br />
� Reference light is in general a blackbody radiator<br />
� A good source should have a CRI >80 to start competing with other conventional<br />
sources<br />
http://www1.eere.energy.gov<br />
/buildings/ssl/measuring_cri.<br />
html<br />
30
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