Incredibly versatile and easy to use, the HL27 Focusing Headlamp has a light output of 309 lumens making it excellent for a variety of uses where you might need a lot of light. It has a removable top strap and can be used with a HARD HAT style safety helmet using the included helmet clips. The easy-to-grip twist focusing ring makes it easy to adjust the beam from flood to spot, even while wearing gloves. Our Pure Beam Focusing Optic produces our largest, Ultra-View Flood Beam, giving you the ability to shed light on a big area while the Bulls-Eye Spot Beam can illuminate targets as far as 122 meters (400 feet) away while still giving you an enhanced field of vision with its transition halo. Our patent-pending headlamp light-control system uses our Light Output Control Wheel and a fully encased sensor that detects a magnetic field, making the light output control more durable and weatherproof. For added durability, an expandable Z-Cord provides power to the LED from the battery pack and is built in to the headband to reduce the possibility of snagging.Backed by Coast's lifetime guarantee against defects in materials and workmanship. Tested and rated to ANSI/FL1 standards by an independent laboratory.