10
The Lighting Handbook
Luminous flux Luminous intensity Illuminance Luminance
Basic parameters used lighting
Luminous flux Φ
Luminance L
Lumen [lm]
[lm/sr*m2]=[cd/m2]
Luminous intensity Illuminance E
Candela [lm/sr]=[cd] Lux [lm/m2]=[lx]
Ω solid angle into which luminous flux emitted
area hit luminous flux
AL cos = visible areas light source
ρ reflectance area
= 3.14
for diffuse surface areas
Ι =
Φ
Ω
E Φ
A
L =
Ι
AL cos
L =
E ρ*
