How to 转换 luminous flux in lumens (lm) to illuminance in lux (lx).
You can 计算 lux from lumens and surface area.
Lux and lumen units represent different quantities, so you can't 转换 lumens to lux.
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)
For a spherical 光照 source, the area A is equal to 4 times pi times the squared sphere radius:
A = 4⋅πi>r 2
So the illuminance 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⋅πi>r(ft)2)
So
lux = 10.76391 × lumens / (square feet)
or
lx = 10.76391 × lm / ft2
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) = ΦV(lm) / A(m2)
For a spherical 光照 source, the area A is equal to 4 times pi times the squared sphere radius:
A = 4⋅πi>r 2
So the illuminance 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):
Ev(lx) = ΦV(lm) / (4⋅πi>r(m) 2)
So
lux = lumens / (square meters)
or
lx = lm / m2
求 the luminous flux on a surface of 4 square meters and illuminance of 500 lux
ΦV(lm) = 500 lux × 4 m2 = 2000 lm
