Nitecore EF1 - 830 Lumens Heavy Duty - Designed to Last The EF1 from Nitecore is a brand-new flashlight that contains "explosion-proof"technology that sets it apart from other industrial-strength flashlights. It can function as both an everyday carry light and a searchlight, so versatility is one of its key strengths. It's also a great choice to put among your emergency supplies. This is a powerfully bright flashlight, with a max output of 830 lumens with a run time of 1h 45min. The EF1 has the advantage of being compatible with CR123 batteries as well as a single 18650 cell. The EF1 casts a wide-ranging beam, with a maximum beam distance of 270 meters, due to its smooth (SMO) reflector with Nitecore's "precision digital optics technology". It has a powerful CREE XM-L2 U3 LED for extreme brightness to light up dark areas while on the job. Adaptable in All Environments The Nitecore EF1 is designed for intense, potentially unsafe environments and is built with many features that will stand up to such conditions. One of these features is its ability to engage in explosion suppression for Class D substances through its 10mm epoxy resin lens. Class D is a technical classification used by the National Electric Code (NEC) to indicate that a flashlight, in this case the EF1, is suitable for use in environments that consist of highly combustible substances like propane, gasoline, naphtha, benzene, butane, ethyl alcohol, acetone and methane. The flashlight body is created for challenging circumstances, crafted from an aerospace-grade aluminum alloy that comes with a military grade hard anodized finish. The EF1 is rated as IP67. This IP rating is a bit different than typical IPX ratings, in that it means that your EF1 is not only waterproof, it is also dustproof. With an IP67 rating, the EF1 is shielded from all dust and can be submerged underwater up to 1 meter. Attractive and Sleek, Yet Rugged and High-Performing With an impact resistance of 1.5 meters, Nitecore's EF1 is ready for the rigors of everyday wear and tear. Another great highlight of the EF1 is its simple-to-operate switch that slides, located on the body; it is easy to click through for three different levels of brightness. This flashlight also comes with Nitecore's pioneering advanced temperature regulation (ATR technology) which automatically allows the user to regulate the lumen output based on the aluminum shell's temperature. This incredible little flashlight's structure has a very effective regulation circuit that gives the user a strong and dependable beam.