Convert Foot-lamberts to Lamberts
Convert Foot-lamberts (fL) to Lamberts (L) instantly and accurately.
Conversion Formula
L = fL × 0.001076391042
About Foot-lamberts
The foot-lambert (fL) equals 1/(π×0.09290304) cd/m² ≈ 3.426 cd/m², the luminance of a perfect diffuse surface emitting 1 lumen per square foot. The SMPTE standard for cinema screen luminance is 14 fL (≈48 cd/m²); home projectors are rated 10-35 fL. Still standard in US cinema and theatre engineering. 1 fL = 1/(π×ft²) 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 An incandescent lamp globe at 3 200 K has luminance ~1 L; a clear sky is ~0.94 L. Superseded by cd/m² in SI photometry. 1 L = 10⁴/π cd/m².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
| Foot-lamberts (fL) | Lamberts (L) |
|---|---|
| 1 fL | 0.00107639 L |
| 2 fL | 0.00215278 L |
| 5 fL | 0.00538196 L |
| 10 fL | 0.0107639 L |
| 25 fL | 0.0269098 L |
| 50 fL | 0.0538196 L |
| 100 fL | 0.107639 L |