lux
lx
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illuminance
Illuminance Conversions
Convert illuminance units including lux, kilolux, millilux, foot-candles, phots, and nox with practical lighting references.
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Common Questions
What does lux measure?
Lux measures illuminance: the visible light arriving on a surface. One lux equals one lumen per square meter.
How many lux are in one foot-candle?
One foot-candle equals approximately 10.7639 lux.
Are lux and lumens interchangeable?
No. Lumens measure total luminous flux, while lux measures how densely that light reaches a surface. The same lamp produces different lux levels at different distances and areas.
Is illuminance the same as screen brightness?
No. Screens are commonly rated by luminance in candelas per square meter, often called nits. Lux measures light falling onto a surface.
Show all 6 units
lux
lx
kilolux
klx
millilux
mlx
foot-candle
fc
phot
ph
nox
nx
Acceleration
9 units ready
Angle
8 units ready
Area
10 units ready
Data Storage
10 units ready
Density
12 units ready
Dynamic Viscosity
11 units ready
Electric Charge
12 units ready
Electric Current
10 units ready
Electric Potential
8 units ready
Electrical Capacitance
8 units ready
Electrical Conductance
9 units ready
Electrical Inductance
8 units ready
Electrical Resistance
8 units ready
Energy
9 units ready
Flow Rate
12 units ready
Force
10 units ready
Fuel Economy
8 units ready
Illuminance
6 units ready
Kinematic Viscosity
8 units ready
Length & Distance
9 units ready
Luminance
8 units ready
Magnetic Field Strength
7 units ready
Magnetic Flux
7 units ready
Magnetic Flux Density
9 units ready
Power
8 units ready
Pressure
8 units ready
Radio/Wavelength
8 units ready
Speed
5 units ready
Temperature
3 units ready
Time
9 units ready
Torque
8 units ready
Volume
11 units ready
Weight and Mass
8 units ready
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