Is Luminous Flux Converter free to use?

Yes, Luminous Flux Converter is completely free. No subscription, no credit card, and no account required — ever.

Do I need to create an account to use Luminous Flux Converter?

No account is needed. Luminous Flux Converter works instantly in your browser — just open the page and start using it.

Is Luminous Flux Converter safe? Does it store my data?

Luminous Flux Converter processes your data locally in your browser. Nothing is sent to or stored on our servers.

How do I use Luminous Flux Converter?

Open the tool, enter or paste your input, and your result appears instantly. Use the copy button to save it. The whole process takes under a minute.

Luminous flux Converter

Convert luminous flux units like lumen.

Convert Units

From:

To:

Result:

Convert luminous flux measurements in lumen and other units.

What is Luminous Flux Converter?

Luminous flux is the total amount of visible light emitted by a source per second, weighted by the human eye's colour sensitivity. Unlike luminous intensity (directional), flux measures total light output in all directions. Lumens are the key metric on modern light bulb packaging.

Understanding the Units

Lumen (lm)

The SI derived unit of luminous flux. One lumen is the flux emitted in one steradian by a 1 candela source.

Common Uses: Light bulb output, projector brightness, flashlight ratings

Kilolumen (klm)

One thousand lumens — used for high-output lighting.

Common Uses: Stadium lighting, industrial fixtures, high-output LEDs

Conversion: 1 klm = 1,000 lm

Common Conversions

Candle flame: ~12–14 lumens
40 W incandescent bulb: ~450 lumens
60 W incandescent bulb: ~800 lumens
100 W incandescent bulb: ~1,600 lumens
LED equivalent to 60 W: 800 lumens at 8–10 W

Conversion Formulas

Luminous flux from intensity: Φ = I × Ω (intensity × solid angle in steradians)
Full sphere = 4π steradians ≈ 12.57 sr
Efficacy (efficiency): lm/W = lumens ÷ watts consumed
Illuminance: lux = lumens ÷ area (m²)

Practical Examples

Reading light: 400–800 lm recommended for comfortable reading

Living room general lighting: 1,500–3,000 lm total

Outdoor security floodlight: 700–1,300 lm

Home cinema projector: 2,000–3,000 ANSI lumens for a bright image

When to Use Each Unit

Lumens (lm): Comparing all light sources — bulbs, LEDs, projectors, flashlights

Kilolumens (klm): High-output commercial and industrial lighting fixtures

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