Change Illuminance Units

Change between lux, foot-candles and phot units.

Choices for this device

Na only the units wey you choose this browser go remember. E no save numbers or other inputs. E go use them for new examples wey you open alone; shared links and workspace cards go keep their own choices.

Your numbers

Converted value

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Conversion factors dey relative to the base unit wey dey show. Input precision limit the output precision wey make sense; this no change physical quantity or assess safety.

Formula

y = x × a ÷ b

x na di input, y na di converted value, a na di original-unit factor and b na di target-unit factor. Use di factors for di table below.

Unit conversion factors

Base unit: lx

Unit	Base units for each listed unit
Lux	1
Foot-candles	10.7639104167
Phot	10,000

Change between lux, foot-candles and phot units.

Example wey show the calculation

Value to convert: 1
From unit: Foot-candles
To unit: Lux

Converted value: 10.7639104167 lx
Value for base unit: 10.7639104167 lx

Where e fit work and limits

Conversion factors dey relative to the base unit wey dey show. Input precision limit the output precision wey make sense; this no change physical quantity or assess safety.

We check inputs for missing values and allowed ranges. Result wey pass the finite numeric range no go show. Rounding affect wetin display, while calculation use the model numeric precision.

Check your units and assumptions before you rely on result. Changing label no convert currency or physical unit.

Version of di formula: 66f2a7bef664 · Example don get check: 2026-10-30

Method