Unit converter
Illumination converter
Convert illuminance units including lux, foot-candles, phot, and nox.
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1 lx = 1 m·cd
All Illumination units
From 1 lx| Unit | Value |
|---|---|
| Lux lx | 1 |
| Meter-candela m·cd | 1 |
| Centimeter-candela cm·cd | 0.0001 |
| Foot-candela ft·cd | 0.09290304 |
| Phot ph | 0.0001 |
| Nox nox | 1,000 |
| Lumen/square meter lm/m² | 1 |
| Lumen/square centimeter lm/cm² | 0.0001 |
| Lumen/square foot lm/ft² | 0.09290304 |
| Watt/square centimeter (at 555 nm) W/cm² | 0.0000000015 |
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Reference
How illumination conversion works
Illuminance measures luminous flux incident on a unit area. Values are normalized to Lux before conversion to the requested output unit.
Values are converted to lux first, then from that reference into the requested unit. Keeping a single documented reference reduces inconsistent pair-by-pair constants.
Unit reference
| Unit | Symbol | 1 unit in lx |
|---|---|---|
| Lux | lx | 1 |
| Meter-candela | m·cd | 1 |
| Centimeter-candela | cm·cd | 10,000 |
| Foot-candela | ft·cd | 10.76391042 |
| Phot | ph | 10,000 |
| Nox | nox | 0.001 |
| Lumen/square meter | lm/m² | 1 |
| Lumen/square centimeter | lm/cm² | 10,000 |
| Lumen/square foot | lm/ft² | 10.76391042 |
| Watt/square centimeter (at 555 nm) | W/cm² | 683,000,000 |
Long-tail directory
Every indexed conversion
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From Meter-candela (m·cd)
From Centimeter-candela (cm·cd)
From Foot-candela (ft·cd)
Primary source
Definitions and standards
The SI framework is checked against NIST Guide for the Use of the International System of Units. Conventional factors are retained from the extended ConvertWin inventory and carry the accuracy note shown above.
See Methods & sources for rounding rules, exact-value handling, and review policy.
Questions
Illumination FAQ
What is the reference unit for illumination conversions?
ConvertWin uses lux (lx) as the internal reference for this category, then converts to the selected output unit.
How accurate is this illumination converter?
SI relationships follow the cited reference. Conventional and domain-specific factors use the established ConvertWin factor inventory; verify safety-critical work against the governing standard.