The silva trail speed is an extremely lightweight and compact headlamp with a fantastic light output of 400 lumens of up to an 85 metre range ideal for the advanced runner skier and cyclist at just 62g the head torch itself is extremely lightweight making it incredibly stable and comfortable to wear while you are enjoying high impact activities the battery pack is separate and can be clipped onto a waist band or stowed in a pocket so that this head torch keeps the bulk down while offering maximu