Citizen COBs are one of the most economical choice for DIYers. The CLU-1825 series is the industry leader in efficiency and typically outperforms the popular CREE CXB3590 by up to 10% or more at most currents
The CLU-1825 series is a nominal 50V COB which can operate up to a whopping 5.75A max (approximately 364W!). Best efficiency is seen below 160W with this chip .
Can be mounted directly via handy mounting holes, for solderless option this chip uses BJB Holder model 47.319.4160.50
Precut Arctic thermal pads are available here
80CRI offers a general spectrum with the red peak centered around 600 nm