High efficiency white LEDs have advanced to the point where they can replace glow bulbs and other light sources not only as indicators, but also for illumination. While many of the claims made about ...

Almost all inexpensive commercial LED flashlights use a 4.5V power supply—three AA or AAA batteries—because white LEDs require 3.3 to 3.5V to fully turn on. Thus ...

The capacitors are 22 microF. “Dyn” is a dynamo. The part to the left of the dotted line is a perfectly standard LED flashlight circuit. The right is the 'squeeze to charge/power lights' addition. And ...

The Takeaway: Maglite’s Mag-Tac LED Rechargeable and Mag-Tac LED CR123 tactical flashlights share some features, including impact- and water-resistance, body diameter, and grip, as well as a ten-year ...

Many of us store a flashlight around the house for use in emergency situations. Usually, regular alkaline batteries are fine for this task, as they’ll last a good few years, and you remember to swap ...