Some boundaries are made to be pushed. Thanks to the revolutionary Cree mt-g2 led, the tk35 ultimate edition produces 1800-lumen maximum output while still keeping the size and power options intact. Besides the output boost, the neutral white Cree mt-g2led also provides better color rendition. The light features dual tail switch system for one hand operation. product Features Utilizes Cree mt-g2 led with a lifespan of 50,000 hours modes of operation >low: 25 lumens (150 hours) >mid: 250 lumens (13 hours 30 min.) >high: 750 lumens (4 hours) >turbo: 1800 lumens (1 hour 30 min.) >strobe: 1800 Lumens >SOS: 250 lumens neutral white tint for better color rendition orange-peel reflector which produces a 75-degree wide beam angle which gives you maximum mid-range coverage strobe ideal for disorienting or signaling with 14640cd peak beam intensity SOS for emergency situations digitally regulated output--maintains constant brightness reverse polarity protection to protect from improper battery installation compact, flat body design for ease of hold and carry low-voltage warning function to remind users of low power dual button switch in the tail, convenient operation intelligent memory circuit waterproof to 2 meters for 30 minutes premium type iii hard-anodized anti-abrasive finish toughened ultra-clear glass lens with anti-reflective coating.