High performance, versatile, all aluminum headlamps which can also be used as general purpose angled flashlights without the headband.

H31 Specs: (cool white version)
Beam Type: 80 degree spill beam spread / 11 degree (3.8 feet at 20 feet) hot spot
High:         H1 220 Lm (0.9 hrs)   or    H2  120 Lm (2 hrs) / 4Hz Strobe
Medium:    M1  43 Lm (12 hrs)    or   M2    24 Lm (23 hrs)
Low:         L1      5 Lm (3.7 days) or    L2   0.5 Lm (21 days)
Light output are out the front (OTF) values. Runtime tests are done using Panasonic CR123A lithium batteries. Runtimes are usually much shorter with rechargeable RCR123 (16340) batteries, especially with protected 16340s that have higher discharge cut off voltage.
LED: Cree XP-G Cool White (color temperature 6100-6500 K)

H31w Specs: (neutral white version)
Beam Type: 80 degree spill beam spread / 11 degree (3.8 feet at 20 feet) hot spot
High:         H1   189 Lm (0.9 hrs)   or    H2    103 Lm (2 hrs) / 4Hz Strobe
Medium:    M1    37 Lm (12 hrs)    or   M2    21 Lm (23 hrs)
Low:         L1     4.3 Lm (3.7 days) or    L2   0.4 Lm (21 days)
Light output are out the front (OTF) values. Runtime tests are done using Panasonic CR123A lithium batteries. Runtimes are usually much shorter with rechargeable RCR123 (16340) batteries, especially with protected 16340s that have higher discharge cut off voltage.
LED: Cree XP-G Neutral White (color temperature 4200 K)

H31c Specs: (CRI type LED, warm white version)
Beam Type: 80 degree spill beam spread / 9 degree hot spot
High:         H1 140 Lm (0.9 hrs)   or    H2  80 Lm (2 hrs) / 4Hz Strobe
Medium:    M1  30 Lm (12 hrs)    or   M2    16 Lm (23 hrs)
Low:         L1      4 Lm (3.7 days) or    L2   0.4 Lm (21 days)
Light output are out the front (OTF) values. Runtime tests are done using Panasonic CR123A lithium batteries. Runtimes are usually much shorter with rechargeable RCR123 (16340) batteries, especially with protected 16340s that have higher discharge cut off voltage.
LED: Philips LUXEON Rebel (Typical CRI: 85, Norminal CCT: 4000K)

H31F Specs: (flood/floody version)
Beam Type: Floody beam from frosted lens, 90 degree beam spread
High:         H1 209 Lm (0.9 hrs)   or    H2  114 Lm (2 hrs) / 4Hz Strobe
Medium:    M1  41 Lm (12 hrs)    or   M2    23 Lm (23 hrs)
Low:         L1   4.8 Lm (3.7 days) or    L2   0.4 Lm (21 days)
Light output are out the front (OTF) values. Runtime tests are done using Panasonic CR123A lithium batteries. Runtimes are usually much shorter with rechargeable RCR123 (16340) batteries, especially with protected 16340s that have higher discharge cut off voltage.
LED: Cree XP-G Cool White (color temperature 6100-6500 K)

H31Fw Specs: (flood/floody + neutral white version)
Beam Type: Floody beam from frosted lens, 90 degree beam spread
High:         H1 180 Lm (0.9 hrs)   or    H2  98 Lm (2 hrs) / 4Hz Strobe
Medium:    M1  35 Lm (12 hrs)    or   M2    19.6 Lm (23 hrs)
Low:         L1   4.1 Lm (3.7 days) or    L2   0.4 Lm (21 days)
Light output are out the front (OTF) values. Runtime tests are done using Panasonic CR123A lithium batteries. Runtimes are usually much shorter with rechargeable RCR123 (16340) batteries, especially with protected 16340s that have higher discharge cut off voltage.
LED: Cree XP-G Neutral White (color temperature 4200 K)

H31Fc Specs: (flood/floody + CRI type LED, warm white version)
Beam Type: Floody beam from frosted lens, with 90 degree beam spread
High:         H1 130 Lm (0.9 hrs)   or    H2  76 Lm (2 hrs) / 4Hz Strobe
Medium:    M1  28 Lm (12 hrs)    or   M2    15 Lm (23 hrs)
Low:         L1      3.8 Lm (3.7 days) or    L2   0.38 Lm (21 days)
Light output are out the front (OTF) values. Runtime tests are done using Panasonic CR123A lithium batteries. Runtimes are usually much shorter with rechargeable RCR123 (16340) batteries, especially with protected 16340s that have higher discharge cut off voltage.
LED: Philips LUXEON Rebel (Typical CRI 85, Norminal CCT 4000K)

H31Fr Specs: (flood/floody, red tint version)
Beam Type: 80 degree spill beam spread, 9 degree hotspot
High:         H1 110 Lm (0.9 hrs)   or    H2  60 Lm (2 hrs) / 4Hz Strobe
Medium:    M1  22 Lm (12 hrs)    or   M2    12 Lm (23 hrs)
Low:         L1      2.5 Lm (3.7 days) or    L2   0.2 Lm (21 days)
Light output are out the front (OTF) values. Runtime tests are done using Panasonic CR123A lithium batteries. Runtimes are usually much shorter with rechargeable RCR123 (16340) batteries, especially with protected 16340s that have higher discharge cut off voltage.
LED: Cree XP-E Red (Dominant Wavelength 620-630nm)

H31Fb Specs: (flood/floody, red tint version)
Beam Type: Floody beam from frosted lens, with 90 degree spill beam spread
High:         H1  67 Lm (0.9 hrs)   or    H2  36 Lm (2 hrs) / 4Hz Strobe
Medium:    M1  13 Lm (12 hrs)    or   M2    7 Lm (23 hrs)
Low:         L1      1.5 Lm (3.7 days) or    L2   0.14 Lm (21 days)
Light output are out the front (OTF) values. Runtime tests are done using Panasonic CR123A lithium batteries. Runtimes are usually much shorter with rechargeable RCR123 (16340) batteries, especially with protected 16340s that have higher discharge cut off voltage.
LED: Cree XP-E Blue (Dominant Wavelength 465-485nm)

H31r Specs: (red tint version)
Beam Type: 80 degree spill beam spread / 9 degree hot spot
High:         H1 100 Lm (0.9 hrs)   or    H2  60 Lm (2.4 hrs) / 80 Lm (1.7 hrs) / 4Hz Strobe
Medium:    M1  20 Lm (9 hrs)    or    M2   10 Lm (30 hrs)
Low:         L1   2 Lm (3 days)   or    L2   0.2 Lm (16 days)
Light output are out the front (OTF) values. Runtime tests are done using Sanyo 2000mAh Eneloop AA batteries.
Operating Voltage Range: 0.7V - 2.5V
LED: Cree XP-E Red (Dominant Wavelength 620-630nm)

H31b Specs: (red tint version)
Beam Type: 80 degree spill beam spread / 9 degree hot spot
High:         H1 70 Lm (0.9 hrs)   or    H2  38 Lm (2 hrs) / 4Hz Strobe
Medium:    M1  14 Lm (12 hrs)    or   M2    8 Lm (23 hrs)
Low:         L1     1.6 Lm (3.7 days) or    L2   0.15 Lm (21 days)
Light output are out the front (OTF) values. Runtime tests are done using Panasonic CR123A lithium batteries. Runtimes are usually much shorter with rechargeable RCR123 (16340) batteries, especially with protected 16340s that have higher discharge cut off voltage.
LED: Cree XP-E Blue (Dominant Wavelength 465-485nm)

Weight:
0.97 oz (27.6 gram) without battery or headband

Dimensions:
Diameter: 0.90 inch (23 mm)
Length:    2.57 inch (65 mm)

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

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)
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

Included Items:
Pocket clip
One black silicone holder with headband
One GITD silicone holder
Two o-rings

Operations:
This light has 3 main levels (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.

This light has 3 main levels (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.

Basic Operation
Short click turns on the light to High or turns off the light.
Long click (press and hold for about 0.6 seconds) turns on the light to Low.

Advanced Operation and Configuration
Short click turns on the light to High. Short click again quickly to cycle from High to Medium, and Low.
Press and hold to cycle from Low to High, release to set. When press and hold, the light always cycle from Low to High regardless which level you are currently in.
Double click to toggle and select between the two sub-levels for that main level. Sub-level selections (except the strobe) for the 3 main levels are memorized after the light is turned off and through battery changes.
The second sub-level of the High can be configured after 6 double clicks. Double click (startng with the 7th) to cycle and select different brightness levels or strobes. Short click to turn off the light when finishing configurations. The selections for the second sub-level of the High are memorized after the light is turned off and through battery changes.