Citizen GEN6 COBs are the latest generation of Citizen COBs They offer inproved flux and thermal dissipation over GEN5, and can operate up to an amazing 120C case temperature.
CLU-1212 is a nominal 36V COB which can operate up to 2.76A max (approximately 100W). Best efficiency is seen below 50W with this chip.
Precut Arctic thermal pads are available for the CLU048 series here
80CRI offers a general spectrum with the red peak centered around 600 nm
Tech specs on the COBs are found on the Citizen GEN6 datasheet here
Recommended Thermal Pads are 0.5mm thick Arctic brand, cut to size from larger sheets. You can read about them here