Convert Foot-lamberts to Candelas per square metre
Convert Foot-lamberts (fL) to Candelas per square metre (cd/m²) instantly and accurately.
Conversion Formula
cd/m² = fL × 3.4262591
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 metre
The candela per square metre (cd/m²), informally called the nit, is the SI coherent unit of luminance. A typical laptop screen is 250-500 cd/m²; an HDR TV reaches 1 000-4 000 cd/m²; a clear blue sky is ~3 000-8 000 cd/m². Luminance is the photometric quantity directly perceived as brightness. 1 cd/m² = 1 nit.
Quick Reference Table
| Foot-lamberts (fL) | Candelas per square metre (cd/m²) |
|---|---|
| 1 fL | 3.42626 cd/m² |
| 2 fL | 6.85252 cd/m² |
| 5 fL | 17.1313 cd/m² |
| 10 fL | 34.2626 cd/m² |
| 25 fL | 85.6565 cd/m² |
| 50 fL | 171.313 cd/m² |
| 100 fL | 342.626 cd/m² |