Convert Apostilbs to Stilbs
Convert Apostilbs (asb) to Stilbs (sb) instantly and accurately.
Conversion Formula
sb = asb × 3.183098862e-5
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 Stilbs
The stilb (sb) equals 1 cd/cm² = 10⁴ cd/m². The CGS luminance unit. A candle flame has luminance ~0.5-0.6 sb; a frosted incandescent bulb ~10 sb; a xenon short-arc lamp up to 170 000 sb. Named from the Greek στίλβω (to glitter). Found in pre-1970 photometry texts. 1 sb = 10⁴ cd/m².
Quick Reference Table
| Apostilbs (asb) | Stilbs (sb) |
|---|---|
| 1 asb | 3.183 × 10-5 sb |
| 2 asb | 6.366 × 10-5 sb |
| 5 asb | 0.000159155 sb |
| 10 asb | 0.00031831 sb |
| 25 asb | 0.000795775 sb |
| 50 asb | 0.00159155 sb |
| 100 asb | 0.0031831 sb |