Convert Foot-lamberts to Candelas per square foot
Convert Foot-lamberts (fL) to Candelas per square foot (cd/ft²) instantly and accurately.
Conversion Formula
cd/ft² = fL × 0.3183098862
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 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
| Foot-lamberts (fL) | Candelas per square foot (cd/ft²) |
|---|---|
| 1 fL | 0.31831 cd/ft² |
| 2 fL | 0.63662 cd/ft² |
| 5 fL | 1.59155 cd/ft² |
| 10 fL | 3.1831 cd/ft² |
| 25 fL | 7.95775 cd/ft² |
| 50 fL | 15.9155 cd/ft² |
| 100 fL | 31.831 cd/ft² |