Brightest 1,000 Lumen Tactical Long Gun Light. The ProTac Rail Mount HL-X is a 1,000 lumen weapon-mounted light featuring a dedicated fixed-mount for Picatinny rails. It uses either a remote switch or a standard push-button tail switch, and can run on multiple battery sources. TEN-TAP® Programming allows selection of three different operating programs. 1 high/strobe 2 high only 3 low/high. High for maximum illumination: 1,000 lumens; 332m beam; runs 1.25 hours (CR123A batteries); runs 1.5 hours (SL-B26 battery pack); 27,600 candela. Low for extended run time: 60 lumens; 80m beam; runs 20 hours (CR123A batteries); runs 23 hours (SL-B26 battery pack); 1,600 candela. Strobe for signaling or disorienting: runs 2.5 hours (CR123A batteries); runs 3.25 hours (SL-B26 battery pack). Dual fuel – uses two CR123A lithium batteries (included); also accepts one Streamlight SL-B26T protected Li-Ion USB rechargeable battery pack. Easy to use pressure switch comes with a button for on/off and a pressure switch for momentary activation. Integrated rail clamp attaches to MIL-STD-1913 rails. Easy to attach, secure mounting. Durable, anodized aluminum construction with impact-resistant tempered glass lens. IPX7 rated with the Standard button switch installed; waterproof to 1 meter for 30 minutes. IPX4 rated with the Remote Pressure Switch installed. Operating temperature: -40°F to +120°F. Includes two CR123A lithium batteries, remote pressure switch, push-button tail switch, remote retaining clips, double-sided tape and zip ties. Solid State power regulation provides maximum light output throughout battery life. Run Time on High1.25 hours. Run Time on Low23.00 hours. Battery Type Streamlight SL-B26 Protected Li-Ion USB Rechargeable Battery Pack, CR123A Lithium. Length5.43 inches (13.79 centimeters). Weight6.40 ounces (181.44 grams) – 6.90 ounces (195.61 grams).