Check the datasheet on the spectrum. https://cdn.samsung.com/led/file/resource/2020/03/Data_Sheet_LM301H_CRI90_Rev.2.1.pdf
This is published by Samsung. We use the 3500K version. See page 10
Quoting the headline efficiency of the LED's is not an uncommon practice (As of June these numbers have actually gone up from 3.03 to 3.1). You of coarse are correct in saying it does not have the same efficiency when running at a higher current. However if you look at the datasheet the fitting...
LM301H Leds are almost available in any Colour Temperature and multiple CRI's . See https://www.samsung.com/led/lighting/mid-power-leds/3030-leds/lm301h/
Ja LM301H's are real. They have been available from Samsung since April 2019. On the issue of refurbishment we have been in business for 31 yrs so I am hoping this will continue.
https://www.samsung.com/led/lighting/applications/horticulture-lighting/