In the dark a flashlight is a priceless commodity your senses can't do without. This is especially true when your house is enveloped in darkness for days. Our house was one of the 260,000 homes in Northern Illinois that lost power for days after a torrential rainstorm. And for those powerless days, my U2 Ultra was the most valuable part of our household. My U2's adjustable light feature was invaluable at night because we used the 100-lumen setting to read, then the two-lumen setting for household tasks--because the batteries lasts for 40 hours at this setting. Days of living in the dark demonstrated why the variable-output feature of the U2 makes it the ultimate personal flashlight. I've used the U2 Ultra's powerful 100-lumen beam in low-light shooting courses with my handgun, and now it has proven itself as a finely adjustable instrument for surviving a long-term power outage. Its balance between battery consumption and high-intensity brightness proved absolutely crucial.
See the U2 flashlight: