Convert Apostilbs to Microcandelas per square metre
Convert Apostilbs (asb) to Microcandelas per square metre (µcd/m²) instantly and accurately.
Conversion Formula
µcd/m² = asb × 318309.8862
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 Microcandelas per square metre
The microcandela per square metre (µcd/m²) equals 10⁻⁶ cd/m². Used in precision dark-sky photometry and in measuring the luminance of unlit passive surfaces. OLED deep-black levels are typically 0.0001-0.01 cd/m², about 100-10 000 times larger than this scale. 1 µcd/m² = 10⁻⁶ cd/m².
Quick Reference Table
| Apostilbs (asb) | Microcandelas per square metre (µcd/m²) |
|---|---|
| 1 asb | 318310 µcd/m² |
| 2 asb | 636620 µcd/m² |
| 5 asb | 1591550 µcd/m² |
| 10 asb | 3183100 µcd/m² |
| 25 asb | 7957750 µcd/m² |
| 50 asb | 15915500 µcd/m² |
| 100 asb | 31831000 µcd/m² |