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 .
Light Measurement Conversion Table
Illuminance
| Unit | per 1 lx |
|---|---|
| Lux (lx) | 1 lx |
| Foot Candle (fc) | 0.0929031 fc |
| Phot (ph) | 0.0001 ph |
Luminance
| Unit | per 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
| Unit | per 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
| Unit | per 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
Light Measurement Conversion Chart FAQs
Common questions about the light measurement conversion chart.
What does this light measurement conversion chart include?
It lists the most common light measurement units side by side with their conversion factors, plus a free printable PDF you can download for offline reference.
Can I download this chart as a PDF, CSV, or JSON?
Yes. Use the "Download Conversion Chart (PDF)" button for a printable version, or grab the machine-readable CSV/JSON conversion-factor dataset linked on this page.