Photometric Units

Photometric Units

SI Units



Non-SI Units

Luminous Intensity
candlepower = the candela

Luminance
1 stilb = 1 cd/cm² = 10,000 cd/m²
1 apostilb = (1/p) cd/m² = 0.3183 cd/m²
1 lambert = (10,000/p) cd/m² = 3183 cd/m²
1 millilambert = 0.001 lambert = 3.183 cd/m²
1 footlambert = (1/p) cd/ft² = 3.426 cd/m²
1 candela/ft² = 10.76 cd/m²
1 candela/in.² = 1550 cd/m²

Illuminance
1 footcandle = 1 lm/ft² = 10.76 lm/m² or lx






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