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Illumination converter
How much light lands on a surface. 4 units, converted from one table of exact factors.
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1 lux in every other illumination unit
Computed by the same engine that runs the converter above, so these can never drift apart from it.
| From | Equals | Unit |
|---|---|---|
| 1 lux | 0.09290304 | foot-candle (fc) |
| 1 lux | 0.0001 | phot (ph) |
| 1 lux | 0.001 | kilolux (klx) |
What each unit actually is
Most converters give you a number and stop. Where a figure is exact by definition we say so, and where it is an average or shifts with conditions we say that too — that is usually the thing you needed to know.
| Unit | Symbol | What it actually is |
|---|---|---|
| lux | lx | One lumen per square metre. Office lighting is roughly 500. |
| foot-candle | fc | One lumen per square foot. Still standard in US lighting design. |
| phot | ph | The CGS unit. |
| kilolux | klx | Full daylight is about 10–25 klx. |
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