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Unit converters · Light

Illumination converter

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

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How it works

Two steps, no account

1

Pick your units

SI lux, imperial foot-candles, or CGS/legacy units like the phot and nox.

2

Enter a value

The result updates instantly as you type, or as soon as you change either unit.

FAQ

Common questions

Is my data sent anywhere?
No. The conversion runs entirely in your browser — nothing is transmitted, logged, or stored.
What's a typical lux reading?
Direct sunlight is roughly 100,000 lux, an overcast day is around 1,000 lux, a well-lit office is 300–500 lux, and moonlight is under 1 lux — useful reference points when checking a light meter reading.
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Illumination Converter

Our Illumination Converter helps you convert between different units of illumination and light measurement. Essential for lighting design, photography, and architectural applications.

How to Use the Converter

1. Enter Value

  • Input your illumination value
  • Select source unit
  • Choose target unit
  • View instant conversion

2. Available Units

SI Units

  • Lux (lx)
  • Meter-candle (m⋅c)
  • Candela steradian/m² (cd⋅sr/m²)
  • Lumen/m² (lm/m²)

Traditional Units

  • Foot-candle (ft⋅c, fc)
  • Phot (ph)
  • Flame
  • Nox

Specialized Units

  • Lumen/cm²
  • Lumen/ft²
  • Watt/cm² at 555nm
  • Centimeter-candle

Key Features

Conversion Options

  • 12+ illumination units
  • International standards
  • Scientific measurements
  • Industry-specific units

Unit Categories

  1. Metric System

    • SI units
    • Derived units
    • Scientific notation
    • Modern standards
  2. Imperial/US Units

    • Foot-candles
    • Square foot based
    • Traditional measures
    • Industry standards
  3. Technical Units

    • Radiometric
    • Photometric
    • Energy-based
    • Area-specific

Use Cases

1. Lighting Design

  • Interior lighting
  • Architectural planning
  • Workplace safety
  • Display systems

2. Photography

  • Studio lighting
  • Exhibition spaces
  • Film production
  • Digital imaging

3. Technical Applications

  • Safety standards
  • Quality control
  • Research facilities
  • Manufacturing

Technical Features

  • Precision: High accuracy calculations
  • Real-Time: Instant conversions
  • Copy Function: Easy result sharing
  • Mobile Responsive: Works on all devices

Why Use Our Converter

1. Comprehensive Coverage

  • Multiple standards
  • Technical units
  • Industry measures
  • Scientific notation

2. User-Friendly Design

  • Clear interface
  • Easy selection
  • Instant results
  • Copy functionality

3. Professional Accuracy

  • Precise calculations
  • Standard compliance
  • Technical specifications
  • Industry standards

Understanding Illumination

Common Applications

  1. Architectural Design

    • Room lighting
    • Workspace planning
    • Safety compliance
    • Energy efficiency
  2. Professional Photography

    • Exposure settings
    • Light measurement
    • Studio setup
    • Display calibration
  3. Industrial Use

    • Safety standards
    • Quality control
    • Process monitoring
    • Equipment specification

Best Practices

  1. Unit Selection

    • Match requirements
    • Consider standards
    • Verify accuracy
    • Check regulations
  2. Measurement Process

    • Use proper units
    • Account for conditions
    • Document readings
    • Maintain consistency

Remember: Proper illumination measurement is crucial for safety, efficiency, and quality in various professional applications.