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Lumens to Lux conversion

Luminous flux in lumens (lm) to illuminance in lux (lx) calculator and how to convert.

Enter the luminous flux in lumens, choose the area unit type, enter a radius in meters for a spherical light source or a surface area in square meters for any light source and press the Calculate button:

lm
Area unit type:
lx

Lumens to Lux calculation formula

Calculation with area in square feet

The illuminance Ev in lux (lx) is equal to 10.76391 times the luminous flux Φv in lumens (lm) divided by the surface area A in square feet (ft2):

Ev(lx) = 10.76391 * Φv(lm) / A(ft2)

The illimunance Ev in lux (lx) is equal to 10.76391 times the luminous flux Φv in lumens (lm) divided by 4 times pi times the squared sphere radius r in feet (ft):

Ev(lx) = 10.76391 * Φv(lm) / (4 * π * r(ft)2)

Calculation with area in square meters

The illuminance Ev in lux (lx) is equal to the luminous flux Φv in lumens (lm) divided by the surface area A in square meters (m2):

Ev(lx) = 10.76391 * Φv(lm) / A(m2)

The illimunance Ev in lux (lx) is equal to the luminous flux Φv in lumens (lm) divided by 4 times pi times the squared sphere radius r in meters (m):

E v(lx) = Φ v(lm) / (4 * π * r (m)2)
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