All Unit Conversions

Light Measurement Conversion Chart

Quick-reference light measurement conversion chart. The tables below compare the most common units side by side. Download the free PDF for offline and printable use.

What is light (luminous units)?

Light measurements quantify luminous flux (lumens), illuminance (lux), and luminous intensity (candela). One lux equals one lumen per square meter.

Key conversions

  • 1 lux (lx) = 1 lumen per square meter (lm/m²)
  • 1 foot-candle ≈ 10.764 lux
  • Luminous intensity is measured in candela (cd)
  • 1 lumen = 1 cd·sr (candela steradian)

Standards, method, and review

Values are calculated from the shared conversion-factor library. Exact defined relationships are preserved; displayed results are rounded only for readability.

Reviewed by All Unit Conversions Editorial Team. Updated .

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Light Measurement Conversion Table

Illuminance

Illuminance conversion factors
Unitper 1 lx
Lux (lx)1 lx
Foot Candle (fc)0.0929031 fc
Phot (ph)0.0001 ph

Luminance

Luminance conversion factors
Unitper 1 cd/m²
Candela per Square Meter (cd/m²)1 cd/m²
Foot Lambert (fL)0.291864 fL
Lambert (L)0.000314159 L
Stilb (sb)0.0001 sb

Luminous energy

Luminous energy conversion factors
Unitper 1 lm⋅s
Lumen Second (lm⋅s)1 lm⋅s
Lumen Minute (lm⋅min)0.0166667 lm⋅min
Lumen Hour (lm⋅h)0.000277778 lm⋅h

Luminous intensity

Luminous intensity conversion factors
Unitper 1 cd
Candela (cd)1 cd
Hefnerkerze (HK)1.10742 HK

Values are calculated from the shared conversion-factor library. Exact defined relationships are preserved; displayed results are rounded only for readability.

Related Converters & Charts

Cite this chart: Reference this light measurement conversion chart with a link to All Unit Conversions.

Light Measurement Conversion Chart FAQs

Common questions about the light measurement conversion chart.