Color characterization of multicolor multichip LED luminaire for indoor

The healthcare units require dynamic color and illuminance for multitasking and wellbeing of the patients and caregivers. This requisite could be effectively satisfied by the light emitting diode (LED)-based light source. Hence this paper presents a color characterization of multicolor LED luminaire featuring illuminance from 50 to 1200 lx and color dynamism from 2700 to 6500 K using red-green-blue-amber-cool white-neutral white LEDs. The color quality assessment is conducted for 11 illuminance levels and seven correlated color temperature. The work achieved a maximum of circadian action factor (CAF) tunability 3.9 with luminous efficacy radiation (LER) above 300 lm/W and color rendering index above 90 for all correlated color temperatures (CCTs). The prototype model designed featured a beam spreading angle of 30° and luminous efficacy of 53.8 lm/W delivering a circadian stimulus of 70% for CCTs above 4000 K and illuminance above 500 lx. The blue light hazard efficiency of radiation scored a low value of 0.22 at 5700 K, 318 lm/W. This quantifies that the designed luminaire is photobiological safe. The designed luminaire is also tested for rendering the image quality using structural similarity index. These investigations assay that the designed multicolor multichip LED luminaire replaces conventional lamps deployed for dynamic illuminance and task operation in healthcare units.