Nitecore HC90 Rechargeable XM-L2 LED Headlamp (900-Lumens) Battery Type: 1x186502xCR123 Maximum output: 900 lumens Nitecore Headlamps Produces an extremely bright 900 lumens Equipped with a CREE XM-L2 (T6) LED Requires either one 18650 or two CR123A Batteries (not included) HC90 and operate for up to 200 hours Very lightweight