Running

^ alpkit gamma

although note:

A note on batteries: The Gamma and Indigo headtorches have not been designed to work with lithium batteries. Lithium batteries have a high output during discharge which means they can cause the torch to overheat and possibly damage electronics and LEDs. We recommend using a good quality alkaline battery such as Energizer. Cheap batteries are more likely to leak and leave a gooey mess on the contacts.