|کد مقاله||سال انتشار||مقاله انگلیسی||ترجمه فارسی||تعداد کلمات|
|147311||2018||33 صفحه PDF||سفارش دهید||8242 کلمه|
Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)
Journal : Journal of Building Engineering, Volume 18, July 2018, Pages 19-32
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 1200â¯lx and color dynamism from 2700 to 6500â¯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 300â¯lm/W and color rendering index above 90 for all correlated color temperatures (CCTs). The prototype model designed featured a beam spreading angle of 30Â° and luminous efficacy of 53.8â¯lm/W delivering a circadian stimulus of 70% for CCTs above 4000â¯K and illuminance above 500â¯lx. The blue light hazard efficiency of radiation scored a low value of 0.22 at 5700â¯K, 318â¯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.