Language Lessons: Lumens
Relates to: Light intensity
Category: Tactics and equipment.
Application(s) of Use: flashlights, weapon lights, light bulbs—anything that emits light
Definition: a measure of the total quantity of visible light emitted by a source
Why it Matters: There are several different ways to measure light intensity, but lumens (symbol: “lm”) are the current gold standard.
Into the Weeds: We used to roll with candlepower, which is an old and obsolete measurement which assesses the amount of light falling onto a target rather than the total amount of light emitted. The lumen equivalent of candlepower is called lux, which is used to measure luminous flux per unit area.
Pre-flourescent and LED bulbs often stated brightness levels in watts. Though this is an extremely dated method, many LED and CFL bulbs will list watt equivalency numbers on the box—likely so your grandparents won’t be confused.
What’s particularly noteworthy about lumens is that it’s a measurement mostly used only for frequencies the human eye can detect, rather than the entire spectrum emitted by a given light source. There are several methods to measuring lumens, but the current industry standard is to use a integration sphere which completely diffuses any light source.
The TL;DR version is this: Higher lumens just means more light from the source, not necessarily a better flashlight or light bulb.
In Summary, a lumen is just a way to measure total light output of a given source. In and of itself it offers no other performance information.
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