Lumens to Lux Converter Formula
Understand the math behind the lumens to lux converter. Each variable explained with a worked example.
Formulas Used
Lux (lm/m²)
lux = area > 0 ? lumens / area : 0Foot-Candles
foot_candles = area > 0 ? lumens / area * 0.0929 : 0Variables
| Variable | Description | Default |
|---|---|---|
lumens | Lumens(lm) | 800 |
area | Area(m²) | 10 |
How It Works
Lumens to Lux
Lux = Lumens / Area (m²)
Lumens measure total light output. Lux measures illumination intensity on a surface.
Typical Light Levels
Worked Example
An 800 lumen bulb illuminating a 10 m² room.
lumens = 800area = 10
- 01Lux = 800 / 10 = 80 lux
- 02Foot-candles = 80 x 0.0929 = 7.4 fc
Frequently Asked Questions
What is the difference between lumens and lux?
Lumens measure total light output from a source. Lux measures how bright a surface is. The same number of lumens spread over a larger area produces fewer lux.
How many lumens do I need for a room?
Kitchens and workspaces need 300-500 lux. Living rooms need 100-300 lux. Bedrooms need 50-150 lux. Calculate: Lumens needed = Lux target x Area in m².
Ready to run the numbers?
Open Lumens to Lux Converter