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Some types of penlight bulbs or small LEDs have a built-in lens. Best Tactical Flashlights called this the Best Police Flashlight for Duty. Solaray has 5 brightness levels including a strobe and SOS mode while Fenix Ultra bright flashlight has total 6 modes. It's uber-compact, extremely light and the LED bulb has a life expectancy of 50,000 hours.
LEDs maintain nearly constant color temperature regardless of input voltage or current, while
