Multispectral optimization for cluster leds with wide operable range

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. In this paper, we unleash the above constraint; 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 proposed algorithm enables the multispectral cluster to modulate the color temperature from 2800K to 8000K in the full range ambient temperature (10^oC ~ 100^oC) with high color quality scale (CQS > 85 points) and the possibly highest luminous efficiency.