XUAN series COBs (36 V) have thermally conductive mirror-aluminum substrate and attach to heatsink by holder or screws. Covering 2–50 W, MCPCB device can achieve >130 lm/W. There are 7 designs in 1313 and 1919 dimensions with CCTs from 2,700K to 6,500K and CRI ratings of 82, 92, and >97 Ra. In ceramic PCB package, 9, 19, and 29 W Color Choice® (Color on Demand) CHI COBs offer seamless color temperature tunability via 2,700K and 5,700K segments. All mixture points achieve >110 lm/W and CRI >80.