Each LED features an onboard collimator that focuses the light into tight beam for an intensity of 75 lumens each. The fully integrated flashlight head (the LED lamps, lenses and reflectors) optimizes light color, intensity and dispersion. The FlashLED FLT-5001 comes standard with three white 1-Watt LEDs. These long-lasting LED lamps operate for more than 100,000 hours (10 years). FlashLED operates for nearly 17 days on three replaceable D-cell batteries.