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Illuminance Converter

Convert between lux, foot-candles, phot, and other illuminance/light intensity units.

Our free Illuminance Converter lets you convert between lux, foot-candles, phot, and other illuminance/light intensity units. It is built for travelers, cooks, students, scientists, and anyone working across measurement systems who need fast, reliable results without installing software or creating an account.

Illuminance Converter runs entirely in your browser on CalculatorsPlus — enter your values, get instant results, and copy or share your output in one click. Your data never leaves your device; we do not store inputs on any server.

Switching between metric and imperial units is a daily need worldwide. The illuminance converter uses standard conversion factors so you get consistent results for recipes, travel, homework, and technical specifications.

Results update in real time as you change inputs, so you can explore "what if" scenarios — adjust one variable at a time to see how it affects the outcome before committing to a purchase, plan, or decision.

This page includes step-by-step instructions, frequently asked questions, and practical tips below the calculator. Bookmark it for repeat use — many unit conversion tasks come up weekly during projects, studies, or financial planning.

Common Uses

  • Convert recipe measurements between US and metric units
  • Translate specs for international projects or products
  • Science and engineering homework unit checks
  • Travel, fitness, and weather temperature conversions

How to Use the Illuminance Converter

  1. 1

    Select illuminance unit

    Choose lux or foot-candles.

  2. 2

    Enter brightness

    Input the illuminance value.

  3. 3

    Convert

    Use in lighting design or photography.

💡 Tips & Tricks

  • Smartphone light meter apps give rough lux readings.
  • Photography: EV and lux relate through exposure settings.
  • Workplace ergonomics standards cite lux for task lighting.

Frequently Asked Questions

How do I convert lux to foot-candles?
1 foot-candle ≈ 10.764 lux. Divide lux by 10.764 to get foot-candles. Foot-candles are common in US lighting design.
What lux level for an office?
General office work: 300–500 lux on the desk. Detailed work or design: 500–1,000 lux. Building codes specify minimums.
What is the difference between lux and lumens?
Lumens measure total light output from a source. Lux measures light falling on a surface (lumens per square meter). Same bulb, different lux at different distances.
How bright is direct sunlight?
Direct sunlight: roughly 100,000–120,000 lux. Overcast day: 1,000–10,000 lux. Moonlight: about 0.1–1 lux.