Convert Kilocandelas per square metre to Apostilbs
Convert Kilocandelas per square metre (kcd/m²) to Apostilbs (asb) instantly and accurately.
Conversion Formula
asb = kcd/m² × 3141.592654
About Kilocandelas per square metre
The kilocandela per square metre (kcd/m²) equals 1 000 cd/m². The scale for HDR displays and high-brightness monitors: VESA DisplayHDR 1000 requires 1 kcd/m² peak; professional HDR mastering monitors reach 1-4 kcd/m²; an overcast sky measures ~3-8 kcd/m²; a fluorescent tube ~7 kcd/m². 1 kcd/m² = 10³ 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
| Kilocandelas per square metre (kcd/m²) | Apostilbs (asb) |
|---|---|
| 1 kcd/m² | 3141.59 asb |
| 2 kcd/m² | 6283.19 asb |
| 5 kcd/m² | 15708 asb |
| 10 kcd/m² | 31415.9 asb |
| 25 kcd/m² | 78539.8 asb |
| 50 kcd/m² | 157080 asb |
| 100 kcd/m² | 314159 asb |