Guides
Lumens vs Candela
One measures how much light a torch makes. The other measures how much of it is going in the direction you are pointing.
By Scooter M. · Published September 2, 2026
The difference in one paragraph
Lumens measure the total light a flashlight emits in every direction combined. Candela measures the intensity of the beam at its brightest point. A light can have many lumens spread widely, or fewer lumens concentrated tightly. That is why two lights with identical lumen figures can differ by a factor of five in how far they reach.
The analogy that works is water. Lumens are how much water comes out of the hose per second. Candela is what happens when you put your thumb over the end: the same water, concentrated, traveling much further. Nothing has been added; it has been aimed.
How the standard defines them
Under the ANSI/NEMA FL 1 standard, Streamlight defines light output as a measurement of the total quantity of emitted light energy, reported in lumens, and peak beam intensity as the value at the brightest part of the beam, reported in candela. Beam distance is a third figure derived from the second: the distance at which the beam falls to 0.25 lux.
NitecoreLights describes that 0.25 lux threshold in a way that makes it intuitive — it is roughly the illumination of a full moon on a clear night. So a published beam distance of 200 meters means that at 200 meters, the light delivers about as much illumination as moonlight. Useful for seeing that something is there; not enough to read by.
Why it matters when you buy
| Light | Published output | Published beam distance | What that tells you |
|---|---|---|---|
| COAST HP7R | 300 lumens | 352 m | Very tightly focused — a thrower |
| Streamlight ProTac 2L-X | 500 lumens | 165 m | General purpose, balanced beam |
| Streamlight Stinger 2020 | 2,000 lumens | 315 m | High output, moderately focused |
| Fenix C7 V2.0 | 3,300 lumens | 575 m | High output and tightly focused |
| Wurkkos FC11 | 1,300 lumens | 144 m | Floody — designed for close work |
The lesson from that table is that lumens alone cannot tell you whether a light suits your job. If you need to identify something across a field, buy on beam distance or candela. If you need to light an engine bay at arm's length, buy on lumens and ignore beam distance entirely — a tight hotspot is actively unhelpful up close.
Flood, throw and the ratio between them
NitecoreLights notes that the candela-per-lumen ratio can be used to tell whether a flashlight has a spot-type or flood-type beam. A high ratio means the light is concentrated; a low one means it is spread. Very few manufacturers publish candela, but many publish beam distance, which is derived from it and serves the same purpose.
The extremes are both useless as flashlights. A pure flood with no concentration lights your feet and nothing else; a pure spot lights a coin at fifty meters and leaves you blind to everything around it. Every real light is a compromise, and the published beam distance tells you roughly where on that spectrum it sits.
Units we claim to have tested: 0
Every publisher in this category says they tested twenty flashlights. We have not tested any, and we say so. What we do instead: compile the manufacturer's own published ANSI FL1 figures, pull the price the light is selling for right now, and divide one by the other. Every number on this page is one you can check yourself in about two minutes.
Common questions
Are lumens and candela the same thing?
No. Lumens measure the total light emitted in all directions; candela measures the intensity at the brightest point of the beam. A light can have high lumens and low candela if it spreads its light widely, which is why COAST publishes 352 meters of reach from 300 lumens while Streamlight publishes 165 meters from 500.
Are lumens additive?
Total light output is, in the sense that two identical lights produce twice the luminous flux of one. What is not additive is perceived brightness or reach: pointing two lights at the same spot does not make it look twice as bright, because human brightness perception is closer to logarithmic than linear, and it does not double the distance the beam travels.
Are lumens linear or logarithmic?
The measurement is linear — 2,000 lumens really is twice the light energy of 1,000. Your perception of it is not. Doubling output produces a much smaller apparent change than the numbers suggest, which is the main reason a 10,000-lumen light does not look ten times brighter than a 1,000-lumen one.
Are lumens and lux the same?
No. Lumens measure light leaving the source; lux measures light arriving on a surface, in lumens per square meter. That is why the ANSI FL 1 beam-distance figure is defined at 0.25 lux — it specifies how much light lands at the far end, which is a different question from how much left the flashlight.
Sources
- Streamlight, ANSI Information — definitions of light output, beam distance, run time, impact and water resistance under the FL1 standard, read 2026-09-01
- NitecoreLights, ANSI / NEMA FL-1 Guide — FL1 definitions plus a published account of the standard's runtime limitation, read 2026-09-01
- COAST published product specifications — read 2026-09-01
- Streamlight published product specifications — per-mode lumens, runtime, beam distance, impact and IP ratings, read 2026-09-01
- Wurkkos published product specifications and user manuals — read 2026-09-01
- Fenix published product specifications — read 2026-09-01
- Lumen & Ledger method — how every figure on this page is derived
Who writes this
Scooter M. — I am an enthusiast who is genuinely into this. I read the manuals, compile the published specs, and do the math. No lab coat, no test bench, no drawer of free samples. What I can tell you is exactly what a light claims on paper, exactly what it costs right now, and what those two numbers mean when you divide one by the other.
Read next
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The Ledger
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