Builtin over-discharging protection (2.7V cutoff) Durable electronic soft-touch switch Smart user interface provides fast and easy access to all brightness levels and beacon-strobes. Precision machined unibody casing from premium grade aluminum bar stocks Proprietary heat sinking design bonds the LED board directly to the unibody aluminum casing Durable natural hard anodized finish (Type III Class I) Sealed and potted LED driver circuitry Battery reverse polarity protection Tempered optical grade glass Waterproof to IPX7 (2 meters, 30 minutes) LED: Cree XHP35 Cool White (Nominal CCT 5700K) User Selectable Levels: 3 main levels (High, Medium and Low). Each main level can be programmed to one of its two sub-levels. Light Output (runtimes) High: H1 1261 Lm (PID, approx 2.2 hr) or H2 650 Lm (PID, approx 2.8 hrs) / 349 Lm (4.3 hrs) / 155 Lm (12 hrs) Medium: M1 68 Lm (33 hrs) or M2 31 Lm (73 hrs) / 12 Lm (8 days) Low: L1 3.7 Lm (18 days) or L2 0.42 Lm (2.8 months) / 0.06 Lm (5.1 months) / 0.01 Lm (7.1 months) Beacon Strobe Mode: 0.2Hz Beacon at Low / 0.2Hz Beacon at H1 / 4Hz Strobe at H1 / 19Hz Strobe at H1 Light output are ANSI out the front (OTF) values. Runtimes tested (and parasitic drain estimated) using ZL634 batteries. Runtimes of the two PID controlled levels (1126Lm and 580Lm) vary greatly with ambient temperature and air circulation. Operating Voltage Range: 2.7V - 6.0V Battery: One 18650 size (up to 69mm long) 3.6V-4.35V li-ion rechargeable. Batteries are not included in the package. Parasitic Drain: Negligible (much less than the self discharging of a battery) Floody beam from frosted lens, with 90 degree beam spread Dimensions Head Diameter: 0.95 inch (24.2 mm) Length: 3.85 inch (97.8 mm) Weight 1.4 oz (39 gram) 3.0 oz (84.6 gram) with ZL634 battery 4.4 oz (124.6 gram) with ZL634 battery and headband
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