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Illuminance Converter

Free Illuminance Converter, Convert Lux, Foot-Candles, Phot & Millilux Instantly

Convert illuminance between any units instantly with OmniConverter's free online illuminance converter. 1 lux equals 1 lumen per square meter, and 1 foot-candle equals 10.764 lux. Supports lux, foot-candles, phot, millilux, and nox. Whether you're a photographer calculating exposure, a lighting designer meeting building standards, or a safety inspector checking minimum light levels, our converter gives you accurate results.

How It Works

Convert in three simple steps.

1

Enter Your Illuminance Value

2

Select Source and Target Illuminance Units

3

Read Your Converted Light Level

Popular Illuminance Conversions

Lux to Foot-candlesFoot-candles to LuxLux to PhotPhot to LuxFoot-candles to PhotPhot to Foot-candlesLux to MilliluxMillilux to LuxLux to NoxNox to LuxFoot-candles to MilliluxMillilux to Foot-candles

Common Benchmarks

Reference

1 lx → lx

1 lx

Reference

1 lx → fc

0.0929031299 fc

Reference

1 lx → ph

0.0001 ph

Reference

1 lx → mlx

1000 mlx

Reference

1 lx → nx

1000 nx

Real-World Use Cases

Illuminance conversion is essential for architectural lighting design (meeting IESNA or ISO standards in both lux and foot-candles), photography and videography (setting correct exposure for a given light level), workplace safety compliance (minimum lux levels for task lighting), horticulture (plant growth lighting requirements), smart home lighting automation, and comparing solar irradiance readings.

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Frequently asked questions

Quick answers to common conversion questions

What does lux measure?+

Lux measures illuminance, or the amount of light falling on a surface.

How do I convert lux to foot-candles?+

Multiply lux by 0.092903 to estimate foot-candles.

What is a phot?+

A phot is a unit of illumination equal to 10,000 lux.

Why is illuminance different from brightness?+

Brightness is subjective, while illuminance is a measurable amount of light on a surface.

How do I convert millilux to lux?+

Multiply millilux by 0.001 to get lux.

What unit is used in photography?+

Lux and foot-candles are common in lighting and photography contexts.

Can I convert nox to lux?+

Yes, nox is a very small illuminance unit and converts through the standard ratio.

What is a foot-candle?+

A foot-candle measures light intensity over one square foot.

Why do lighting designers use lux?+

Lux gives a standardized measure for lighting levels in indoor and outdoor environments.

Can I compare indoor lighting to sunlight?+

Yes, lux and foot-candles make those comparisons straightforward.

Latest Blog Posts

Tips, guides, and insights about unit conversions

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Quick Answer: Illuminance Converter

Convert illuminance instantly — enter any value and get all units at once. Common illuminance conversions include lux to foot-candles (1 lx = 0. Illuminance conversion is used in photography and cinematography, workplace lighting compliance (OSHA/EN standards), greenhouse planning, stage lighting design, and architecture.

How the Illuminance Converter Works

Our illuminance converter converts between lux, foot-candles, phots, and related units using exact conversion factors. Enter a value in any unit and see instant results in all supported illuminance measures.

Formula & Sources

Lux is SI (lm/m²). 1 foot-candle = 1 lumen/ft² = 10.7639 lux. Phot = 10,000 lux (CGS). Based on CIE photometry.

Worked Example

Example: 500 lux office = 46.45 foot-candles. Photography: 1000 lux → EV ~6 at ISO 100.

Common Illuminance Conversions

Common illuminance conversions include lux to foot-candles (1 lx = 0.0929 fc), foot-candles to lux (1 fc = 10.764 lx), and lux to phot (1 phot = 10,000 lx). Typical office lighting is 300-500 lx, while direct sunlight exceeds 100,000 lx.

When to Use Illuminance Conversion

Illuminance conversion is used in photography and cinematography, workplace lighting compliance (OSHA/EN standards), greenhouse planning, stage lighting design, and architecture.

Accuracy & Common Mistakes

All factors are stored unrounded and computed in double precision. We avoid cumulative rounding by converting via a base unit. Always verify critical results with a second source for safety-critical tasks.

Frequently Asked Questions

How many lux is a foot-candle?

1 foot-candle = 10.7639 lux.

How much lux is office lighting?

Typical offices: 300–500 lux. Sunlight: up to 100,000 lux.

What is the difference between lux and lumens?

Lux = lumens per square meter. Lumens is total light; lux is density on a surface.

Popular Illuminance comparisons

Jump directly to a side-by-side comparison — no typing needed. Also discoverable via search.

Lux (Meter-candle, Lumen/meter²) → Foot-candle (Lumen/foot²)→Lux (Meter-candle, Lumen/meter²) → Phot (Lumen/centimeter²)→Lux (Meter-candle, Lumen/meter²) → Millilux→Lux (Meter-candle, Lumen/meter²) → Nox→Foot-candle (Lumen/foot²) → Phot (Lumen/centimeter²)→Foot-candle (Lumen/foot²) → Millilux→
View all comparisons

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