Convert Apostilbs to Nanocandelas per square metre
Convert Apostilbs (asb) to Nanocandelas per square metre (ncd/m²) instantly and accurately.
Conversion Formula
ncd/m² = asb × 318309886.2
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 Nanocandelas per square metre
The nanocandela per square metre (ncd/m²) equals 10⁻⁹ cd/m². Represents luminance at the threshold of cooled photomultiplier tubes and avalanche photodiode detectors. The darkest OLED black levels (~10⁻⁴ cd/m²) are still five orders of magnitude brighter; this unit is used in single-photon counting photometry. 1 ncd/m² = 10⁻⁹ cd/m².
Quick Reference Table
| Apostilbs (asb) | Nanocandelas per square metre (ncd/m²) |
|---|---|
| 1 asb | 318310000 ncd/m² |
| 2 asb | 636620000 ncd/m² |
| 5 asb | 1.592 × 109 ncd/m² |
| 10 asb | 3.183 × 109 ncd/m² |
| 25 asb | 7.958 × 109 ncd/m² |
| 50 asb | 1.592 × 1010 ncd/m² |
| 100 asb | 3.183 × 1010 ncd/m² |