Please note that this is the flood version of the H31 and the specs below are for the regular H31. The H31F has a frosted lens, which does a great job of smoothing out the beam and making a very nice flood light, but it greatly reduces throw.
Main Features and Specifications
LED: Cree XP-G Cool White (color temperature 6100-6500 K)
User Selectable Modes: 3 (High, Medium and Low). Each mode can be configured to one of the two sub-levels.
Light Output
High:        H1 209 Lm (0.9 hrs)  or   H2 114
Lm (2 hrs) / 4 Hz Strobe
Medium:   M1  41 Lm (12 hrs)   or   M2     23 Lm (23 hrs)
Low:         L1  4.85 Lm (3.7 days)  or   L2   0.4 Lm (21 days)
Light output are out the front (OTF) values. Runtime tests are done using Sanyo 2000mAh Eneloop AA batteries.
Voltages: 0.7V - 2.5V
Battery: One CR123A lithium primary or RCR123 Li-ion rechargeable. Batteries are not included in the package.
Battery Shelf Life: Over 3 years under parasitic drain
Beam Type
90° spill beam spread
Dimensions
Diameter: 0.90 inch (23 mm)
Length:    2.57 inch (81 mm)
Weight
0.97Â oz (35.8 gram)without battery or 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 casing from premium grade Alcoa aluminum bar stock
Durable natural hard anodized finish (Type III Class I)
SCHOTT ultra clear lens with anti-reflection coatings on both sides
Orange peel textured reflector
Glow In The Dark (GITD) silicone ring near the tail cap
Battery power can be locked out by slightly unscrewing the tailcap to prevent unwanted activations or parasitic drain
Waterproof to IPX8
Operations
From Off
Short click turns on the light to High instantly. Click again quickly to cycle from High to Medium, and Low.
Press and hold to cycle through Low, Medium and High, release to set.
When On
Short click turns off the light.
Press and hold to cycle from Low to High, release to set. The light always cycle from Low to High regardless which level you are currently in.
Double click at any level to toggle and select between the two sub-levels for that level. Medium and Low selections are memorized after the light is turned off and through battery changes. H1 is not memorized.
