Our most powerful headlamp, the HL8 has a blazing light output of up to 344 lumens and a runtime of up to 19 hours 15 minutes using 4 AA batteries. The low beam gives you 66 lumens and a runtime of up to 79 hours 15 minutes, making the HL8 a fantastic choice for heavy professional and industrial users or outdoor use where batteries may be scarce. Our Pure Beam Focusing Optic produces our largest flood beam, giving you the ability to shed light on a very large area and the Bulls-Eye Spot Beam can illuminate targets as far as 207 meters (678 feet) away while still giving you an enhanced field of vision with its transition halo. The removable battery pack is easy to clip on a belt or gear webbing and includes a 3 foot extension cord. The HL8 can also be used with a HARD HAT style safety helmet using the included helmet clips. Backed by Coast"s lifetime guarantee against defects in materials and workmanship. Tested and rated to ANSI/FL1 standards by an independent laboratory.