Color temperature and color rendering were not issues for previous use of conventional lamps, because they were usually fixed depending on the respective system. With the introduction of LED technology which offers extensive degrees of freedom with regard to color temperature and color rendering, it makes good sense to measure these parameters and match them up in the event of mixed usage. In addition to general color rendering index Ra, color rendering index R9 should also be taken into consideration, which provides information about saturated red within the spectrum. If the red component is minimal, it can be assumed that red and skin tones will not be ideally rendered. The desired lighting effect is set via the measurement of illuminance.
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