| Title |
Optical and Colorimetric Performance Evaluation of a Dual-Channel CCT-Tunable LED Lighting System for Cyanosis Observation |
| Authors |
Seung-Wan Park ; Yu-Rim Kang ; Yoon-Chul Lee ; Yong Woo Kim ; Hyeon Woo Kim ; Chang-Ju Park |
| DOI |
https://doi.org/10.5207/JIEIE.2026.40.3.157 |
| Keywords |
Color rendering (Ra; Rf; Rf_skin); Cyanosis color-difference index (CCDI); Cyanosis observation; Medical lighting; Tunable correlated color temperature (CCT) |
| Abstract |
This study proposes a dual-channel CCT-tunable LED lighting system for cyanosis observation, combining 3000 K and 5000 K LEDs with lookup table (LUT)-based current control for continuous correlated color temperature (CCT) variation from 3000 to 5000 K. Across the full range, the simulated average illuminance (215.2?224.1lx) and uniformity (0.754? 0.760) satisfied hospital lighting requirements, and color quality remained stable (Ra 92.3?93.8, Rf 89.5?90.2, Rf_skin 91.3?93.3). A CIEDE2000-based cyanosis color-difference index (CCDI), defined as the color difference between modeled normal and cyanotic skin under each spectral power distribution (SPD), increased from 0.86 (3000 K) to 1.54 (5000 K), while the redness (CIELAB a*) of rendered normal skin decreased from 15.4 to 12.4. Because cyanosis perceptibility (favored at higher CCT) and skin-color reproduction (favored at lower CCT) oppose each other, the tunable dual-channel design lets the operator balance the two through CCT control. |