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Lux to Lumens conversion

Illuminance in lux (lx) to luminous flux in lumens (lm) converter calculator and how to convert.

Enter the illuminance in lux (lx), select the area unit type, enter the radius in meters for spherical light source or surface area in square meters for any light source and press the Calculate button:

lx
Area unit type:
lm

Lux to Lumens calculation formula

Calculation with area in square feet

The luminous flux Φv in lumens (lm) is equal to 0.09290304 times the illuminance Ev in lux (lx) times the surface area A in square feet (ft2):

Φv(lm) = 0.09290304 * Ev(lx) * A(ft2)

The luminous flux Φv in lumens (lm) is equal to 0.09290304 times the illuminance Ev in lux (lx) times 4 times PI times the squared sphere radius r in feet (ft):

Φv(lm) = 0.09290304 * Ev(lx) * 4 * π * r (ft)2

Calculation with area in square meters

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

Φv(lm) = Ev(lx) * A(m2)

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

Φv(lm) = Ev(lx) * 4 * π * r 2(m2)
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