Color Rendering Index, CRI, is a widely used metric to provide a means of determining light quality using measured
color shift from a reference source. CRI has several known deficiencies however and there is active research in new
metrics. As part of this research, a new tool has been developed to create a wide variety of spectral power distributions,
SPD. The tool is called a Spectrally Tunable Light Source, STLS. We detail objectives and the detailed design of an
STLS system involving thousands of high-power LEDs across the visible spectrum.
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