For what it's worth, I've got two of these el-cheepo lights, and they are seriously bright with little hot spotting. My only complaint is that the outmost 1-2deg of light has a yellow tint to it. Otherwise, they're great. I've had them to 70m, and they haven't flooded yet. I can get the light meter at work and work out how many kelvin they are.
I picked up 2 of these. I have no means to measure the output but the specs on the LEDs would confirm that 8K lumens is correct. The build quality is fine. I have not yet detected any color temp issues. I am shooting Canon Magic Lantern RAW video and GoPro 5 4k. Have taken these lights only on two shallow macro dives and they did fine.
See review of a branded version of the light here: https://nemopowertools.com/divelightblog/the-best-new-dive-light-of-2017-the-max-planck-8000/. 2 of these lights put out 16K L. With batteries,total cost is under $250. Crazy value if they keep working.