Convert Millicandelas per square metre to Apostilbs
Convert Millicandelas per square metre (mcd/m²) to Apostilbs (asb) instantly and accurately.
Conversion Formula
asb = mcd/m² × 0.003141592654
About Millicandelas per square metre
The millicandela per square metre (mcd/m²) equals 10⁻³ cd/m². The luminance of a moonless night sky is ~10⁻³ cd/m²; a quarter-moon sky ~10⁻² cd/m². OLED screens in deep-black mode and unlit LCD panels measure a few mcd/m². Also the range for very dim indicator lamps. 1 mcd/m² = 10⁻³ cd/m².
About Apostilbs
The apostilb (asb) equals 1/π cd/m² ≈ 0.3183 cd/m², defined as the luminance of a perfectly diffuse Lambertian surface with an exitance of 1 lm/m². Introduced by the CIE in 1940 and used in European photometry standards and retinal illuminance calculations. 1 asb = 1/π cd/m² ≈ 0.3183 cd/m².
Quick Reference Table
| Millicandelas per square metre (mcd/m²) | Apostilbs (asb) |
|---|---|
| 1 mcd/m² | 0.00314159 asb |
| 2 mcd/m² | 0.00628319 asb |
| 5 mcd/m² | 0.015708 asb |
| 10 mcd/m² | 0.0314159 asb |
| 25 mcd/m² | 0.0785398 asb |
| 50 mcd/m² | 0.15708 asb |
| 100 mcd/m² | 0.314159 asb |