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Physics > Luminous (Optics) Units and Equivalents

Luminous Flux

Unit Name Symbol SI Equivalent
candlepower (spherical)
  12.5664 cd-sr
lumen
lm 1 cd-sr

Luminous Intensity

Unit Name Symbol SI Equivalent
bougie dècimale
bd 1.02 cd
bougie international
bi 1 cd
candela
cd 1 cd
candle (int.)
c 1.01937 cd
candle (new unit)
  1 cd
carcel
  10 cd
Carcel unit
  9.79613 cd
hefner unit (hefnerkerze)
HK 0.903 cd
violle
  20.4 cd

Luminous Luminance

Unit Name Symbol SI Equivalent
apostilb
asb 0.31831 cd/m2
candela per square meter
cd/m2 1 cd/m2
candle per square centimeter
candle/cm2 1x10 4 cd/m2
candle per square foot
candle/ft2 10.7639 cd/m2
candle per square inch
candle/in2 1550 cd/m2
candle per square meter
candle/m2 1 cd/m2
foot-lambert
ft-L 3.42626 cd/m2
lambert
L 3183 cd/m2
nit
nit 1 cd/m2
stilb
sb 1x10 4 cd/m2