Illumination Converter
Convert illumination levels between lux, foot-candles, and phots.. Use this smart bidirectional calculator to convert between different illumination measurements instantly. See live results, calculation history, and exact formulas.
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Illumination Converter
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Formula
fc = lx × 0.092903044
To convert Lux to Foot-candle, use the formula displayed above.
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How to Convert Illumination Units
To perform a conversion, look up the target unit's conversion factor relative to the base unit (lux). Below are the exact mathematical formulas for the most common illumination unit pairs:
Lux to Foot-candle
fc = lx × 0.092903044 Foot-candle to Lux
lx = fc × 10.76391 Lux to Phot
ph = lx × 0.0001 Foot-candle to Phot
ph = fc × 0.001076391 Illumination Unit Conversion Charts
Here are the standard reference conversion charts displaying values from 1 to 20 for the most popular unit conversions:
lx to fc
| lx | fc |
|---|---|
| 1 | 0.092903 |
| 2 | 0.185806 |
| 3 | 0.278709 |
| 4 | 0.371612 |
| 5 | 0.464515 |
| 6 | 0.557418 |
| 7 | 0.650321 |
| 8 | 0.743224 |
| 9 | 0.836127 |
| 10 | 0.92903 |
| 11 | 1.021933 |
| 12 | 1.114837 |
| 13 | 1.20774 |
| 14 | 1.300643 |
| 15 | 1.393546 |
| 16 | 1.486449 |
| 17 | 1.579352 |
| 18 | 1.672255 |
| 19 | 1.765158 |
| 20 | 1.858061 |
fc to lx
| fc | lx |
|---|---|
| 1 | 10.76391 |
| 2 | 21.52782 |
| 3 | 32.29173 |
| 4 | 43.05564 |
| 5 | 53.81955 |
| 6 | 64.58346 |
| 7 | 75.34737 |
| 8 | 86.11128 |
| 9 | 96.87519 |
| 10 | 107.6391 |
| 11 | 118.40301 |
| 12 | 129.16692 |
| 13 | 139.93083 |
| 14 | 150.69474 |
| 15 | 161.45865 |
| 16 | 172.22256 |
| 17 | 182.98647 |
| 18 | 193.75038 |
| 19 | 204.51429 |
| 20 | 215.2782 |
lx to ph
| lx | ph |
|---|---|
| 1 | 0.0001 |
| 2 | 0.0002 |
| 3 | 0.0003 |
| 4 | 0.0004 |
| 5 | 0.0005 |
| 6 | 0.0006 |
| 7 | 0.0007 |
| 8 | 0.0008 |
| 9 | 0.0009 |
| 10 | 0.001 |
| 11 | 0.0011 |
| 12 | 0.0012 |
| 13 | 0.0013 |
| 14 | 0.0014 |
| 15 | 0.0015 |
| 16 | 0.0016 |
| 17 | 0.0017 |
| 18 | 0.0018 |
| 19 | 0.0019 |
| 20 | 0.002 |
fc to ph
| fc | ph |
|---|---|
| 1 | 0.001076 |
| 2 | 0.002153 |
| 3 | 0.003229 |
| 4 | 0.004306 |
| 5 | 0.005382 |
| 6 | 0.006458 |
| 7 | 0.007535 |
| 8 | 0.008611 |
| 9 | 0.009688 |
| 10 | 0.010764 |
| 11 | 0.01184 |
| 12 | 0.012917 |
| 13 | 0.013993 |
| 14 | 0.015069 |
| 15 | 0.016146 |
| 16 | 0.017222 |
| 17 | 0.018299 |
| 18 | 0.019375 |
| 19 | 0.020451 |
| 20 | 0.021528 |
Every Illumination Unit, Explained
Illumination conversion covers 3 units. Below is a plain-English definition of each one and where you'll actually meet it in daily life.
Lux (lx)
Lux is the SI unit of illuminance — one lumen per square meter.
Used for: Office and studio lighting requirements; a well-lit office is around 500 lux.
Foot-candle (fc)
A foot-candle is one lumen per square foot, about 10.764 lux.
Used for: Architectural lighting design in the United States.
Phot (ph)
A phot is one lumen per square centimeter, equal to 10,000 lux.
Used for: Historic photographic and laboratory illumination specs.
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Illumination Converter FAQs
What is a Illumination converter?
A Illumination converter is a free online utility that transforms a measurement expressed in one unit of illumination into its equivalent in another, such as converting Lux to Foot-candle.
How do you convert illumination units?
To convert illumination units, choose your from-unit and to-unit from the dropdown list in the tool above, then enter the value you wish to convert. The tool computes the result live in real time using exact SI conversion factor formulas.
What are the most popular illumination conversions?
The most frequently performed illumination conversions on our site are Lux to Foot-candle, Foot-candle to Lux. Our tool pre-calculates full charts and formulas for all of them.
Which illumination units are supported?
We support all standard global SI (metric) and imperial units including Lux (lx), Foot-candle (fc), Phot (ph).
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