It was known among MTB riders who ride at night sometimes: typical XM-L T6 Chinese headlights were unusable in the forest when you move fast. Good diodes (like Nichia 219B) worked. And XM-L was dominant even in very expensive «brandnamed» lights for many years (you could buy Aliexpress headlight for $20, you could bu "Italian" lamp for $250, result is the same)

I'm not in this scene anymore for many years, but when I was, I built my one lamp from custom light engine (essentially round PCB with DC-DC current limiting schematics an LEDs) with 3x219B, Chinese body and CARCLO TIR Optics...

Good times.