LED: Cree XP-G Neutral White (color temperature 4200K)
User Selectable Levels: 3 main level (High, Medium and Low). Each main level can be configured to one of its two sub-levels. The second sub-level of the High can be further configured to different brightness levels or strobes.
Light Output
High: H1 172 Lm (0.9 hrs) or H2 86 Lm (2.4 hrs) / 120 Lm (1.7 hrs) / 4Hz Strobe
Medium: M1 26 Lm (10.5 hrs) or M2 7 Lm (26 hrs)
Low: L1 2.2 Lm (3 days) or L2 0.18 Lm (16 days)
Light output are out the front (OTF) values. Runtime tests are done using Sanyo 2000mAh Eneloop AA batteries.
The 172, 120, 26, 7 and 2.2 Lumen output levels are current regulated. The 86 and 0.18 Lumen output levels are PWM generated.
Operating Voltage Range: 0.7V - 2.5V
Battery: One 1.5V AA (NiMH, lithium or alkaline). 14500 Li-ion batteries are not supported. Batteries are not included in the package.
Parasitic Drain: Negligible (equivalent to 16 years)
Beam Type

80 degree spill beam spread
11 degree (3.8 feet at 20 feet) hot spot
Dimensions
Diameter: 0.90 inch (23 mm)
Length: 3.2 inch (81 mm)
Weight
1.2 oz (35.8 gram)
2.2 oz (61.9 gram) with an Eneloop AA
3.0 oz (84.9 gram) with an Eneloop AA and headband
Features
Electronic soft-touch switch, with a 200,000 cycle operating life
Smart user interface provides fast and easy access to all brightness levels
Precision machined unibody casing from premium grade Alcoa aluminum bar stock
Proprietary heat sinking design bonds the LED board directly to the unibody aluminum casing, providing unblocked thermal paths to over 94% of the surface area.
Durable natural hard anodized finish (Type III Class I)
Ultra clear lens with anti-reflection coatings on both sides
Orange peel textured reflector
Battery power can be locked out by slightly unscrewing the tailcap to prevent unwanted activations or parasitic drain
Waterproof to IPX8 (2 meters, 30 minutes)