By Debmedia Technologies LLP · Kolkata, India · Updated
What Is It and When Do You Need It?
Illuminance measures how much light lands on a surface. Lux is the metric unit and foot-candles are the older imperial unit Lighting plans for offices, shops and photography use these figures.
This converter handles 6 units for lux and shows the result in all of them at once, so you rarely need a second lookup.
How to Use This Tool
- Type the value you want to convert.
- Choose the unit you have in the From list.
- Choose the unit you want in the To list.
- Press Convert and read the answer and the table of every unit.
How the Calculation Works
Every unit is stored as a multiple of one reference unit (the lux). To convert, the value is multiplied into the reference unit and then divided by the size of the target unit. All factors are exact or taken from standard definitions, and results show up to ten significant digits.
Worked Example
| You enter | You get |
|---|---|
| 1 lx | 0.001 klx |
| 10 lx | 0.9290304 fc |
| 100 klx | 100000 lx |
Reference values:
| From | To |
|---|---|
| 1 Lux | 0.001 klx |
| 1 Lux | 0.09290304 fc |
| 1 Lux | 0.0001 ph |
| 1 Lux | 1 lm/m² |
| 1 Lux | 0.09290304 lm/ft² |
Common Uses
- Checking office and workshop lighting levels.
- Photography and film lighting.
- Greenhouse and plant light planning.
- Reading lighting standards.
Tips and Common Mistakes
- One foot-candle is about 10.76 lux.
- A bright office is about 500 lux; bright sunlight can exceed 100,000 lux.
- Use the table under the answer to see the same value in every unit.
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