Lou Minescence
Flashlight Enthusiast
These 2 lights are almost twins. Size, shape, function, price, and output are a close match. The Neutron 2C is slightly longer than the Quark X. The Neutron 2C looks like a Quark with a Fenix PD 31 tail cap.The 4 Sevens has Beacon mode and a little more output with a better warranty.