When choosing a light source, consider where and how you’ll be using it. That will dictate factors such as the size, weight, style and brightness of the device you select.
Light intensity is measured in lumens—20 lumens is enough to read, 1,750 is equivalent to a 100-watt light bulb and 4,000 is enough to set paper on fire. Just remember that larger isn’t always better, as more powerful lights deplete batteries faster.
The type of beam a light source produces is also important. A flood (or fixed) light has a single wide beam, making it suitable for general tasks. Spot beams, on the other hand, are highly focused for seeing long distances; adjustable beams provide a range of viewing options. Red lights are also helpful for maintaining night vision.