1.The OKW head is rated at 680 lumens and 69,000 candela, which provides nearly four times the throw compared to the M600DF. It is ideal for rifle mounted applications that require long distance.
2.It has a super concentrated beam, almost like a laser illuminator, and can light up targets at 200+ yards without any problems. This head proves the futility of chasing maximum lumens; candela is a much better Representation of what you're receiving when you buy a light or head.
3.Runtime is about 75 minutes with an 18650 cell, or 35 minutes with an 18350 cell. 18650 sized lights can also use two CR123 cells with reduced run time and output.