

Details about the FL1 Standard
Commonly abbreviated as the ANSI FL1 Standard, the ANSI/NEMA FL Standard is a set of flashlight performance guidelines. Before the introduction of these standards, you may have seen a variety of phrases on flashlight packaging, such as these

Now that we have defined these ratings
Light output is determined by the total amount of light coming out the-front OTF of the flashlight and is related to the LEDs efficiency and how much power it uses.
Peak beam intensity represents brightness as perceived by the human eye and is related to how the beam is focused by the optical system

lantern, or can be used as a flashlight for directional lighting. 360 degrees of room, or campsite filling light, storm night, power outage
Here is a trick question. when is a 1.5V battery actually 1.5 volts? Ideally, always, but an alkaline batterys voltage decreases as it discharges, so it would almost never be 1.5 volts. This is why LED flashlights require complex electronics, but not all flashlights behave the same way. To capture this behavior, runtime must be presented as a graph, which is not required by the FL1 Standard.