Candela is a unit of measurement that describes a light's peak intensity. Like Lumens, Candelas are an important factor when evaluating a light's output and performance. If a light isn't bright enough, it wont be able to illuminate a target obstructed by rain, fog, gun smoke, or a photonic barrier. High-intensity lights can also blind a target, making it harder for them to attack you, which is why police often deploy high-intensity lights when subduing threatening suspects at night. When shopping for weapon lights, you will want to consider both Lumens and Candelas together. Lights with high Candela ratings may have a smaller beam of light, but more of that light will be focused at the center, making it easier to see things at a distance. If a light has low Candela and high Lumen ratings, it'll have a wide beam, which can be more beneficial in close quarters.