i run a silva head torch on my helmet, dead easy to zip tie and it rotates around 180 degrees too, as it has 2 very bright front lights (with flash) as well as a red (in case my bike rear light fails mid ride) , hence the rotate being a good idea - it has just 1 huge button which is easy for gloves and it runs of 3 aaa batteries - i use rechargables - although the model up uses lith ion, usb rechargeable - superb front light range on them, and very very lightweight!
i run a silva head torch on my helmet, dead easy to zip tie and it rotates around 180 degrees too, as it has 2 very bright front lights (with flash) as well as a red (in case my bike rear light fails mid ride) , hence the rotate being a good idea - it has just 1 huge button which is easy for gloves and it runs of 3 aaa batteries - i use rechargables - although the model up uses lith ion, usb rechargeable - superb front light range on them, and very very lightweight!