Everyday-Use Headlamp. Known for its simplicity and user-friendliness, the Princeton Tec Refuel features only one mode, a dimmable white flood beam. At 300 lumens, this headlamp is easily and intuitively activated, deactivated, and dimmed with a single large, easy-to-find button, and with its asymmetrical single arm bracket, the headlamp is effortlessly positioned to direct light wherever needed. Refuel also has an extremely easy-open battery door, making battery swaps easier than ever.