Hi 880arm, it is a common knowledge that our eyes can't really make out the difference between 500 and 600 lumens without close scrutiny, but I am really surprised to see such a drastic difference in your review between the P1R and the Fury. Really makes me feel if it is worth it to acquire the latest upgraded model of the Fury or a P1R. I really like the idea of running an 18650 and might go for a P1R one day.