Clipse: Mine lasted for ages, I got bored measuring but it did eventually start to blacken though it still worked
bxstylez: the 420ish lumens is from the ROP low (pelican 3854 Low) not the MNS 5 cell, expect around 220 from that one. The spring sits in the normal spring seat but it's just shorter, the spare bulb carrier remains in-tact. You just got to widen the base of the spring a little to fit in its original spot