Acebeam x35
The claim that this compact, cellphone-sized flashlight can pump out 20,000 lumens using three CREE XHP70.2 LEDs is physically impossible for more than a few fleeting seconds (if it can even hit it at all). The Math: A single CREE XHP70.2 LED maxes out at around 4,000 to 5,000 lumens under absolute peak, high-drain conditions. With three of them, the absolute theoretical maximum of the LEDs combined is around 12,000 to 15,000 lumens. The Heat & Size: To actually maintain 20,000 lumens, you need massive heat sinks. A "cellphone-sized" body (134.5mm) simply does not have the surface area to dissipate that much heat. If it actually hits 20,000 lumens on "Turbo" mode, it will step down to a much lower brightness (around 2,000 lumens) within 15 to 30 seconds to keep from melting itself or burning your hand.