The main facts to consider when compare or selecting a flashlight:
- Light brightest ( measure in Lumens )
- Battery type and run time ( rechargeable flashlights )
- Size and weight
- multiple lighting modes
ANSI FL1 standards for flashlights ensure that models are tested and rated in the same way.Total lumens of output, measured in an integrating sphere after the light has been on for 30-120 seconds.
Flashlight Light Output
Flashlight Beam Distance
Norm IPX4 “Water resistant” Light can be splashed with water from all directions without water getting inside.
Norm IPX7 “Water proof” The light can be submerged in 1 meter of water for 30 minutes. Water can leak into the light, but not into areas with electronics or batteries. The light must still operate when removed from the water and then is tested again 30 minutes after being removed.
Norm IPX8 “Submersible” The light can be submerged for 4 hours to some depth greater than 1 meter. The depth would be specified, e.g. IPX8 10 meters. Realistically the light is not put in the given depth of water, but instead is completely submerged in a container and the pressure is then increased to simulate the depth.