Low cost, high color rendition, CCT variable lighting system based on W-G-B LED

This article proposes a novel approach of tunable correlated color temperature (CCT) lighting system with high rendition using three component mixing concept. Using Grassmann’s theory, phosphor coated warm white LED source (CCT 2800 K) is mixed the blue (467 nm) and green (527 light sources detailed mathematical formulation derived for easy controlling variable CCT experimentally validated in this article. As result, locus blended very close to Planckian on Commission Internationale de l’Eclairage (CIE) 1931 chromaticity diagram. The generated evaluated by both CIE rendering index (CRI) method Illuminating Engineering Society (IES) TM-30-18 method. proposed provides wide range CCTs starting from K 7500 CRI (CIE Ra) value 94, fidelity (IES Rf) score around 85 gamut Rg) 95. uses only component, cost comparatively low respect other CRI, available market.