Luminous Flux

Convert luminous flux between lumens, candelas, lux, foot-candles, and candlepower in your browser. Instant, offline-ready, no signup — your numbers stay on your device.

Conversions

Output

1

Candela

1 Lumen → Candela

How was your conversion?

Luminous Flux rating: 4.8 / 5.0 (25 reviews)

About Luminous Flux Converter

Luminous Flux Converter moves between photometric units that describe visible light: lumens (total light output), candela (intensity in one direction), lux (illuminance on a surface), foot-candles, and candlepower. It is the unit a lighting designer reaches for when a fixture spec sheet is in lumens but a building code asks for lux at the floor, or a flashlight brand rates output in candela while a review site compares candlepower. The conversion factors use the SI definitions (1 cd = 1 lm/sr) by default, so chained conversions stay physically consistent. Everything runs as a static page in your browser — no install, no network, no signup.

Best for

  • Lighting designers reconciling lamp lumens with floor-level lux in a building plan
  • Comparing flashlight candela ratings against candlepower figures from product datasheets
  • Photography and stage lighting where foot-candles still appear in older gear manuals

Pros

  • +Lumens, candela, lux, foot-candles, candlepower — all on one panel
  • +Built on SI photometric definitions, so unit chains stay physically consistent
  • +Runs offline once loaded; no analytics, nothing leaves your device

Cons

  • −Solid angle in steradians is not exposed as its own unit (treat it via the lm/cd pair)
  • −Luminous intensity weighted by human eye response (V(λ)) — not a radiometric tool

How to use Luminous Flux Converter

  1. 1

    Enter the source value, color code, or parameters in the input fields.

  2. 2

    Select the source and destination units or models from the option dropdowns.

  3. 3

    Watch the output update instantly in real-time as you type or adjust.

  4. 4

    Copy the converted results to your clipboard with a single click.

Frequently Asked Questions

What is the difference between lumens and candela?
Lumens measure total light output in every direction; candela measures intensity along a single beam. A 1 cd source emitting uniformly emits 4π ≈ 12.57 lm; a focused reflector can produce a high candela value from the same lumen budget by concentrating the beam.
How do I convert lumens to lux?
Lux is lumens per square meter. The formula is lux = lumens / area (m²). Our tool does the unit math when you supply the geometry separately — for a fixed-distance spec, enter lumens on the source side and read lux on the target side using the conversion factor for the area you have in mind.
Does this tool convert candlepower to candela?
Yes. Modern candlepower is treated as nearly equivalent to candela for most product specs (1 candlepower ≈ 1 candela), but older ANSI/flashlight standards use specific measured geometries. The tool uses the standard 1:1 nominal ratio, which matches what most consumer spec sheets list.
Why does photometry depend on the human eye?
Visible-light units are weighted by the photopic response curve V(λ), the human eye's daylight sensitivity. That means a watt of green light produces more lumens than a watt of red or blue. This tool only converts photometric units — it does not calculate radiometric watts or color conversions.
Are my lighting calculations uploaded anywhere?
No. The conversion factors are static and embedded in the page. Everything runs locally in your browser via JavaScript — no network reads your inputs.

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FREE

100% Free

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SIGNUP

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PRIVACY

Private & Secure

Your files never leave your device. All processing is completed locally for maximum privacy.

BATCH

Batch Conversion

Convert multiple files simultaneously to save time. Fast and efficient multi-file queue.

LOCAL

Runs in Browser

Utilizes advanced client-side WebAssembly technology to process files directly inside your tab.

FORMATS

200+ Formats

Supports a wide variety of formats including images, documents, audio, video, and more.

USER REVIEWS

Luminous Flux Quality Rating

4.8
25 reviews

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