Convert Apostilbs to Candelas per square metre
Convert Apostilbs (asb) to Candelas per square metre (cd/m²) instantly and accurately.
Conversion Formula
cd/m² = asb × 0.3183098862
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 Candelas per square metre
The candela per square metre (cd/m²), informally called the nit, is the SI coherent unit of luminance. A typical laptop screen is 250-500 cd/m²; an HDR TV reaches 1 000-4 000 cd/m²; a clear blue sky is ~3 000-8 000 cd/m². Luminance is the photometric quantity directly perceived as brightness. 1 cd/m² = 1 nit.
Quick Reference Table
| Apostilbs (asb) | Candelas per square metre (cd/m²) |
|---|---|
| 1 asb | 0.31831 cd/m² |
| 2 asb | 0.63662 cd/m² |
| 5 asb | 1.59155 cd/m² |
| 10 asb | 3.1831 cd/m² |
| 25 asb | 7.95775 cd/m² |
| 50 asb | 15.9155 cd/m² |
| 100 asb | 31.831 cd/m² |