Is Illuminance Converter free to use?

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

Do I need to create an account to use Illuminance Converter?

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

Is Illuminance Converter safe? Does it store my data?

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

How do I use Illuminance 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.

Illuminance Converter

Convert illuminance units like lux, foot-candle.

Convert Units

From:

To:

Result:

Convert illuminance measurements between lux, foot-candle, phot, and more.

What is Illuminance Converter?

Illuminance measures how much luminous flux falls on a surface per unit area — it tells you how brightly lit a surface actually is. Essential for lighting design, workplace safety standards, photography exposure settings, and agricultural grow-light planning.

Understanding the Units

Lux (lx)

The SI unit of illuminance. One lux = one lumen per square metre.

Common Uses: Lighting design standards, photography, plant growth, workplace regulations

Foot-candle (fc)

Imperial unit of illuminance. One foot-candle = one lumen per square foot.

Common Uses: US lighting industry, film and photography in North America

Conversion: 1 fc = 10.764 lx

Common Conversions

Full moonlight: ~1 lux
Office lighting standard: 300–500 lux
Retail store lighting: 500–1,000 lux
Bright overcast day outdoors: ~10,000 lux
Direct sunlight: ~100,000 lux

Conversion Formulas

Illuminance = Luminous flux ÷ Area (E = Φ/A)
Point source: E = I ÷ d² (intensity divided by distance squared)
Lux to foot-candle: fc = lux ÷ 10.764
Foot-candle to lux: lux = fc × 10.764

Practical Examples

Photography: camera exposure determined by scene illuminance (EV value)

Plant growth: most vegetables need 10,000–50,000 lux for photosynthesis

Operating theatre: 10,000–20,000 lux for detailed surgical visibility

Building code: stairways and corridors require minimum 50–100 lux

When to Use Each Unit

Lux (lx): International standard — architecture, photography, workplace lighting

Foot-candle (fc): US lighting industry, film/photography in North America

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