About flashlight performance measurement

XTAR Light

Apr 26, 2010
You may have heard the term ANSI FL1, which are the standards for flashlights, ensuring that models are tested and rated in the same way. Most manufacturers follow the ANSI FL1 standards describing their flashlights. Based on those info below, you can compare different flashlights, determine the quality, and choose a suitable one.

*Light Output: Measured in lumens. This is a measure of the intensity of the light coming out of the flashlight, on the highest brightness setting powered by new batteries. It may also be shown for multiple light settings.
*Beam Distance: Measured in meters. This is how far the light will shine before the brightness diminishes to the equivalent of the light from a full moon.
*Run Time: Measured in hours. How long does it take the light output to drop to 10% of the rated output on new batteries. Light output may gradually decrease over time, or remain largely constant and then suddenly decrease.
*Max Intensity: It’s the brightest point of the flashlight’s beam. And it’s measured in candela.
*Impact Resistance: It’s how far the light can be dropped onto concrete and still work properly. This test is primarily to ensure the light remains functional after occasional accidental drops.
*Waterproof: Rated using the IPX system. Water resistance is important if using your light in the rain or around bodies of water.

Besides, there are also some other non-ANSI-rated attributes will also influence the flashlights’ performance and your selection, such as, beam type (flood or spot), battery type, lighting modes, UI controls, size and weight, shape and materials, carrying options, accessories...

xtar wk18 package.jpg

(For example, basic info of the wk18 is shown on the package.)