CCT Tunable LED COBs Luminus Devices CCT Tunable LED COBs offer a choice of 6.8mm, 9.2mm, 13.9mm, 19.6mm and 23.5mm LES options, all with two independent channels, warm and cool. These COBs deliver CCTs ranging from 6500K to 2700K, allowing luminaire designers to design human-centric lighting applications with independent CCT and dimming controls. The LED COBs are applicable in hospitality/hotel/restaurant lighting, residential lighting, museums, high-end retail lighting, circadian lighting in hospitals, offices or schools, and human-centric lighting.