Convert Stilbs to Lamberts
Convert Stilbs (sb) to Lamberts (L) instantly and accurately.
Conversion Formula
L = sb × 3.141592654
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.
About Lamberts
The lambert (L) equals 10⁴/π cd/m² ≈ 3 183 cd/m², the luminance of a perfect diffuse surface emitting 1 lumen per square centimetre. The CGS practical luminance unit. An incandescent lamp globe at 3 200 K has luminance ~1 L; a clear sky is ~0.94 L. Superseded by cd/m² in SI photometry. 1 L = 10⁴/π cd/m².
Quick Reference Table
| Stilbs (sb) | Lamberts (L) |
|---|---|
| 1 sb | 3.14159 L |
| 2 sb | 6.28319 L |
| 5 sb | 15.708 L |
| 10 sb | 31.4159 L |
| 25 sb | 78.5398 L |
| 50 sb | 157.08 L |
| 100 sb | 314.159 L |