LED cluster is probably the most relevant among the emerging solid-state lighting techniques. Impressive scenarios of a
wide range of color quality and luminous efficiency have been obtained, mostly at the condition of constant ambient
temperature. This paper removes the constraint in ambient temperature. We present a methodology analogous to a
general lens design rule to optimize step-by-step the spectral power distribution of a white-light LED cluster. The
scheme enables the users to determine the optimal operation to meet requirements such as light efficiency, color quality,
or other figures of merit over a wide range of color temperatures. All main factors influencing the spectral power
distribution (SPD) are discussed, alongside the implementation of a pentachromatic R/G/B/A/CW platform suitable for
clinic use. The result shows the multispectral cluster can be modulated within the color temperature from 2800K to
8000K in the range ambient temperature (10°C ~ 100°C) with high color quality scale (CQS > 85 points) and the
possibly highest luminous efficiency.
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