And it really wakes up my Surefire 6P. This was my first "Real" light I guess you could say, and I was very impressed with it when I bought it a few years ago. But it seems that with each new light I buy, the P6 just got dimmer in comparison. The M60 drop-in brings it back to a respectable output and also brings it back up in rank as one of my favorites lights again. I wouldn't be ashamed to recommend the M60 to anyone in search of new life for their Surefire. :thumbsup: