Illuminance Converter

What is Illuminance?

Illuminance is the measure of how much luminous flux (light) falls on a surface area.

It tells us how bright a surface appears when light hits it.

The SI unit of illuminance is lux (lx), which equals 1 lumen per square meter.

 

Why Use an Illuminance Converter?

• Instantly convert between lux, foot-candles, and other light units.
• Essential for lighting design, photography, architecture, and horticulture.
• Saves time when working with international standards.

 

Common Applications

• Photography – Adjusting exposure with light meters.
• Architecture & Interior Design – Room brightness calculations.
• Street Lighting – Ensuring safe nighttime illumination.
• Horticulture – Measuring light for plant growth.
• Engineering – Industrial and workplace lighting compliance.

 

How to Use the Illuminance Converter

1. Enter the value in any unit (e.g., lux).

2. Select your starting unit.

3. Instantly view results in all supported illuminance units.

 

 Supported Units

• Lux (lx) – SI unit (lumens per square meter)
• Foot-Candle (fc or lm/ft²)
• Phot (ph) – lumens per square centimeter
• Nox (nx) – 1/1000 lux
• Lumens per Square Inch (lm/in²)
• Lumens per Square Centimeter (lm/cm²)

 

 Example Conversions

• 1 foot-candle (fc) ≈ 10.764 lux (lx)
• 1 lux = 0.0929 foot-candles (fc)
• 1 phot (ph) = 10,000 lux (lx)
• 1 nox (nx) = 0.001 lux (lx)

 

 Who Uses This Tool?

• Photographers & Videographers – Light exposure settings.
• Lighting Engineers – Industrial & commercial lighting designs.
• Interior Designers – Room lighting balance.
• Gardeners & Farmers – Light levels for plant growth.
• Students & Researchers – Physics & optics studies.

 

 FAQs

1. What is the SI unit of illuminance?

The SI unit is lux (lx).

2. How many lux is 1 foot-candle?

1 foot-candle = 10.764 lux.

3. What’s the difference between lux and lumens?

Lumens = total light emitted by a source.

Lux = lumens spread over a surface area.

4. How many lux is daylight?

Sunny daylight ≈ 100,000 lux.

Office lighting ≈ 300–500 lux.

Street lighting ≈ 10–20 lux.

5. Is this converter free?

Yes – completely free to use.

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