In August of 2009, the American National Standards Institute approved a standardization specification for flashlight performances. This was developed by a committee of flashlight manufacturers known as the Flashlight Standards Committee of the National Electrical Manufacturers Association. The standards fell under 10 headings.
The light output is the measurement of luminous flux within the sphere and is essentially a measurement of energy.
The run time refers to the nearest quarter hour of output before it drops to below 10%.
Beam distance is the distance from the flashlight to the illuminated object or space equivalent to moonlight.
Peak Beam Intensity
Peak beam intensity measures the intensity of the light at the mid section of the flashlight beam. It’s also a measurement of energy.
This tests the durability of flashlights dropped from certain heights onto concrete with batteries included.
Water resistance is measured using an IP rating system. It comes in three categories:
– IPX4 is water resistant or splash proof from all directions.
– IPX7 is waterproof and resistant to 1-meter submersion for 30 seconds.
– IPX8 is waterproof for a submersion of 4 hours.