Convert Apostilbs to Candelas per square foot
Convert Apostilbs (asb) to Candelas per square foot (cd/ft²) instantly and accurately.
Conversion Formula
cd/ft² = asb × 0.02957195609
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 foot
The candela per square foot (cd/ft²) equals 1/0.09290304 cd/m² ≈ 10.76 cd/m². Used in US lighting engineering; an illuminated office ceiling panel has luminance ~4-8 cd/ft². The ANSI ergonomic limit for computer workstation background sources is ~340 cd/ft². 1 cd/ft² = 1/0.09290304 cd/m².
Quick Reference Table
| Apostilbs (asb) | Candelas per square foot (cd/ft²) |
|---|---|
| 1 asb | 0.029572 cd/ft² |
| 2 asb | 0.0591439 cd/ft² |
| 5 asb | 0.14786 cd/ft² |
| 10 asb | 0.29572 cd/ft² |
| 25 asb | 0.739299 cd/ft² |
| 50 asb | 1.4786 cd/ft² |
| 100 asb | 2.9572 cd/ft² |