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Illuminance Converter - Convert Between Lux, Foot-Candle, Phot Online Free
Convert between lux, foot-candles, and phot for lighting measurements.
What Is a Illuminance Converter?
An illuminance converter converts between different illuminance measurement units.
Supported Units
- Lux (lx) — SI unit. 1 lumen per m2.
- Foot-candle — 1 lumen per ft2 = 10.764 lux.
- Phot — 1 lumen per cm2 = 10,000 lux.
How Does Illuminance Converter Work?
1 phot = 10,000 lux, 1 foot-candle = 10.764 lux, 1 lux = 1 lumen/m2.
How to Use This Tool
- Enter a numeric value — Type the measurement you want to convert.
- Select the source unit — Choose the unit you are converting from.
- Read the results — The tool instantly displays equivalents in every supported unit.
Try our Power Converter or Energy Converter.
Use Cases
Lighting Design
Convert illuminance for interior and exterior lighting.
Photography
Convert light levels for exposure calculations.
Related Tools
- Power Converter - W, kW, HP, BTU/h.
- Energy Converter - J, cal, kWh, BTU.
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Privacy
All calculations are performed entirely in your browser using JavaScript. No data is sent to our servers. We do not store, log, or share any values you enter.
Uses standard photometric conversion factors.
AI Overview
An illuminance converter converts between lux, foot-candles, and phot.
Quick Answers
Lux in 1 foot-candle?
A:10.764.
Lux in 1 phot?
A:10,000.
What is illuminance?
A:Luminous flux per unit area. Light falling on a surface.
How to Use the Illuminance Converter - Convert Between Lux, Foot-Candle, Phot Online Free
- Type the illuminance value you want to convert into the input field. Decimals and large numbers are supported.
- Choose your starting unit from the dropdown menu - for example lux (lx), foot-candles (fc), or phot (ph).
- See the value converted into every supported unit instantly, including nox, or kilolux.
Benefits
- Instant Multi-Unit Conversion
- Multiple Unit Systems
- 100% Free to Use
- Works on Any Device
Common Mistakes
- Lux vs lumens: illuminance vs luminous flux
- Foot-candle is imperial, lux is metric
- Phot is rarely used but exists
- Light levels vary with distance from source
Professional Tips
- Office lighting: 300-500 lux
- Direct sunlight: ~100,000 lux
- 1 foot-candle = 10.764 lux
- Phot is used in older references
Common Use Cases
Lighting Design
Convert for interior/exterior lighting.
Photography
Convert for exposure calculations.
Related Concepts
Lux (lx)
SI unit. 1 lumen per m2.
Foot-candle
1 lumen per ft2 = 10.764 lux.
Phot
1 lumen per cm2 = 10,000 lux.
Frequently Asked Questions
References
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