~Nitecore says~ 

Brighter, smaller and runs longer, the NITECORE NU33 rechargeable headlamp is a noteworthy upgrade from the highly rated NU32 headlamp. Equipped with an upgraded unibody optical lens system, the NU33 emits a bright 700 lumen for distances up to 147 yards on Turbo mode. Switch freely between a primary white LED, offering three brightness settings, to a high CRI auxiliary LED for even flood illumination, ideal for close up tasks and reading. Alternatively, switch to the red auxiliary LED and protect your night vision or a long lasting signal light.