Convert Microcandelas per square metre to Apostilbs
Convert Microcandelas per square metre (µcd/m²) to Apostilbs (asb) instantly and accurately.
Conversion Formula
asb = µcd/m² × 3.141592654e-6
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.
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
| Microcandelas per square metre (µcd/m²) | Apostilbs (asb) |
|---|---|
| 1 µcd/m² | 3.142 × 10-6 asb |
| 2 µcd/m² | 6.283 × 10-6 asb |
| 5 µcd/m² | 1.571 × 10-5 asb |
| 10 µcd/m² | 3.142 × 10-5 asb |
| 25 µcd/m² | 7.854 × 10-5 asb |
| 50 µcd/m² | 0.00015708 asb |
| 100 µcd/m² | 0.000314159 asb |