APF System


The APF (Advanced Pulse-Frequency Transmission System) was developed by Fenix laboratory, a major technology breakthrough of flashlight industry. Allowing the tactical flashlight achieve a higher level of performance:


  • Take light to the extreme. Traditional forward switches are limited by current, and it is difficult to achieve brightness above 2000 lumens. In the age of 21700 batteries gradually expanding, 3100 lumens tactical flashlights are almost impossible; while the flashlight using APF technology can.
  • Make the functional tail cap simpler. Traditional multi-function tail cap needs to achieve functional through the double-layer body or additional channels ; and the flashlight using APF technology offering a strong reliable flashlight in simple structure, we talking about single layer body if specifically.




Constant current circuit and non-constant current circuit

Fenix products use two kinds of circuits, one is constant current circuit, the other is non constant current circuit

Constant current circuit

It refers to that in the process of using the flashlight, through the intelligent adjustment of the circuit, the flashlight always keeps stable light output. Our designers have developed excellent constant current circuit, leading the industry in photoelectric conversion efficiency, so that the limited electric energy can be converted into light energy to keep the brightness stable, providing continuous protection for your journey.

Non constant current circuit

It refers to that with the consumption of battery power, the light output of the flashlight is gradually reduced, so as to ensure more durable service