Lumens to Lux Converter Formula

Understand the math behind the lumens to lux converter. Each variable explained with a worked example.

Use the Lumens to Lux Converter

Formulas Used

Lux (lm/m²)

lux = area > 0 ? lumens / area : 0

Foot-Candles

foot_candles = area > 0 ? lumens / area * 0.0929 : 0

Variables

VariableDescriptionDefault
lumensLumens(lm)800
areaArea(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

| Condition | Lux | |---|---| | Full sunlight | 100,000 | | Overcast day | 10,000 | | Office lighting | 300-500 | | Living room | 50-200 | | Full moon | 0.25 |

Worked Example

An 800 lumen bulb illuminating a 10 m² room.

lumens = 800area = 10
  1. 01Lux = 800 / 10 = 80 lux
  2. 02Foot-candles = 80 x 0.0929 = 7.4 fc

Ready to run the numbers?

Open Lumens to Lux Converter