Petzl LED Conversion/upgrade bulb for Petzl Head Torch Headlamp Zoom Duo MES/E10 CREE. 1W CREE LED with 120 lumen output. 50,000+ hours! Efficient 1W CREE LED with 120 lumen output Fits Petzl Zoom, Zoom ADP, Chrono, Duo, Micro, Mega, Megabelt, Mega Belt Clip, Saxo, Arctic and Arctic Clip series headlamps Maintains focusing ability of Petzl Zoom and other focusing headlamps. Beam patterns will vary depending on the type of reflector used A whopping projected lifespan of 50,000+ hours! Simple installation, straight swap for the existing bulb  no tools required