Convert Picocandelas per square metre to Apostilbs
Convert Picocandelas per square metre (pcd/m²) to Apostilbs (asb) instantly and accurately.
Conversion Formula
asb = pcd/m² × 3.141592654e-12
About Picocandelas per square metre
The picocandela per square metre (pcd/m²) equals 10⁻¹² cd/m². A theoretical subunit for precision photometric standards and astrophysical brightness modelling. Even the darkest measurable surfaces in calibrated laboratories have luminance many orders of magnitude above this scale. Used only in radiometric standard traceability chains. 1 pcd/m² = 10⁻¹² 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
| Picocandelas per square metre (pcd/m²) | Apostilbs (asb) |
|---|---|
| 1 pcd/m² | 3.142 × 10-12 asb |
| 2 pcd/m² | 6.283 × 10-12 asb |
| 5 pcd/m² | 1.571 × 10-11 asb |
| 10 pcd/m² | 3.142 × 10-11 asb |
| 25 pcd/m² | 7.854 × 10-11 asb |
| 50 pcd/m² | 1.571 × 10-10 asb |
| 100 pcd/m² | 3.142 × 10-10 asb |