Description from Petzl

Compact multi-beam headlamp, ultra-powerful and rechargeable, with REACTIVE LIGHTING technology. 900 lumens

With 900 lumen brightness at only 100 g, SWIFT RL is the most powerful of the Petzl compact headlamps. With REACTIVE LIGHTING technology, a sensor analyzes the ambient light and automatically adjusts the brightness to user requirements. The headband is reflective for night visibility. It has a two-part construction for excellent stability in dynamic and committing activities such as mountaineering, trail running or skiing. SWIFT RL is intuitive, with a single button for easy control over all lamp functions. Rechargeable, it has a five-level gauge for precise monitoring of the battery charge level.

Ultra-bright and lightweight: 900 lumens at only 100 g.
Optimized comfort and burn time:
- longer burn time, greater visual comfort and less manual operation with REACTIVE LIGHTING mode: the light sensor automatically adjusts brightness and beam pattern, optimizing battery usage
- visual comfort, from the two beam patterns (flood or mixed) giving high-performance lighting for outdoor activities: proximity vision, movement and distance vision
- comfortable wear, from the ergonomic adjustable headband with two-part construction (Petzl patent), for optimal stability during dynamic activities
- reflective headband for night visibility
- Lithium-Ion 2350 mAh battery, rechargeable via the type B micro USB port, with battery charge indicator
Intuitive and convenient to use:
- ease of use, with a single button providing control over all functions: ON/OFF, lighting modes, brightness and locking
- choice of two lighting modes, selected with a long press: REACTIVE LIGHTING or STANDARD LIGHTING
- LOCK function to avoid accidentally turning it on during transit or storage, or to lock lighting settings during your activity
- five-level gauge for precise monitoring of the battery charge level
- headlamp can be tilted upward for seeing ahead when it is worn around the neck.
- detachable, washable headband
Specifications
Light output: 900 lumens (ANSI-FL1 STANDARD)
Weight: 100 g
Technology: REACTIVE LIGHTING or STANDARD LIGHTING
Beam pattern: flood or mixed
Energy: 2350 mAh Lithium-Ion rechargeable battery (included)
Charging time: 6 h
Watertightness: IPX4 (weather-resistant)

Lighting performance
Lighting performance as defined by the ANSI/PLATO FL 1 protocol
Lighting technology Lighting color Lighting levels Brightness Distance Burn time Reserve
REACTIVE LIGHTING white MAX BURN TIME 100 lm 35 m 10 to 50 h 10 lm for 2 h
STANDARD 300 lm 55 m 5 to 40 h 15 lm for 2 h
MAX POWER 900 lm 150 m 2 to 30 h
STANDARD LIGHTING MAX BURN TIME 10 lm 12 m 100 h 10 lm for 2 h
STANDARD 200 lm 55 m 5 h 15 lm for 2 h