Hey and cheers.
I want to discuss a custom LED light with COB´s (chip on board) leds. It should be Luminous chips witch draw 140W from a wall and I will use 4. With Mean Well HLG 54V, 480W power supply i can run the chips with some (10 %) reserve on 2,03 Amps (108W) each. With optics with 93 % efficiency i can get 12 071 lumens from each chip and 48 284 lumens total. That´s 100,5 lm/W. In comparison with 630W cmh Lumatec witch efficiency is 111 lm/W that´s not bad-digital power supply is not so efficient instead i think. It is also pretty cheap light setup. Hardware (LED chips, DC power supply, optics) cost around 370 €-Luminous chips aren´t so expensive as Crees.
So it´s nothing new. And what do you think, are these chips good enough for 120x120 box?
I think this video is informative and i used it in my project.