Convert Apostilbs to Millicandelas per square metre
Convert Apostilbs (asb) to Millicandelas per square metre (mcd/m²) instantly and accurately.
Conversion Formula
mcd/m² = asb × 318.3098862
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.
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.
Quick Reference Table
| Apostilbs (asb) | Millicandelas per square metre (mcd/m²) |
|---|---|
| 1 asb | 318.31 mcd/m² |
| 2 asb | 636.62 mcd/m² |
| 5 asb | 1591.55 mcd/m² |
| 10 asb | 3183.1 mcd/m² |
| 25 asb | 7957.75 mcd/m² |
| 50 asb | 15915.5 mcd/m² |
| 100 asb | 31831 mcd/m² |