WeTestLights.com was built and is currently maintained by the testing staff at Light & Motion.
The FL-1 standard is an ANSI standard developed by a large group of flashlight manufacturers who were tired of all the false lumens claims in the market. The standard covers lumen measurement, drop testing, beam throw, as well as ingress protection.
The FL-1 Standard is a voluntary standard that the manufacturers must decide themselves to follow. Once you test your products based on the standard you are then able to use the icons registered to the standard that demonstrate the brand is adhering to the FL-1 in their performance reporting.
Here are the primary icons used by brands that adhere to the FL-1 Standard:
Look for these icons on the product packaging to determine if the brand is reporting to the standard. Some brands have created very similar looking icons, but unless they show the “FL-1” name as above, they are not legally bound to report accurate numbers. For instance a brand could be reporting theoretical lumen output. Because they do not define their testing standard, they can claim almost anything on the packaging.
Beam angle measurement is not part of the FL-1 standard. “we test lights” uses FWHM (Full width at half maximum), which is a standard method for measuring optics. This methodology measures the full power of the beam at the center spot and then rotates the light until the power drops to 1/2 the power at the center spot. The test is performed with a light meter that measures lux. The light shines directly at the meter - this is the max lux. The light is then rotated away from the meter until the measurement drops to 1/2 max. This is the half angle. Multiply this by 2 and you have the beam angle.