UnitConIllumination
Illuminance measures how much visible light reaches a surface. Lux is the SI unit, while foot-candle remains common in US lighting design and building standards. This converter helps compare lighting recommendations, exposure references, and safety requirements. It is useful for photographers, architects, and facility planners.
Common conversions
| From | To |
|---|---|
| 1 Foot-Candle | 10.76391 Lux |
| 300 Lux | 27.87091 Foot-Candle |
| 500 Lux | 46.45152 Foot-Candle |
| 1000 Lux | 92.90304 Foot-Candle |
| 1 Phot | 10,000 Lux |
Frequently asked questions
Lux measures illuminance, or lumens per square meter. It tells you how brightly a surface is lit.
Lumens measure total light output, while lux measures how much of that light lands on a surface area. Area is the key difference.
A foot-candle is a customary illuminance unit used mainly in the US. It is equal to one lumen per square foot.
Many offices aim for roughly 300 to 500 lux, though exact needs depend on the task and local lighting standards.