Convert Nanocandelas per square metre to Foot-lamberts
Convert Nanocandelas per square metre (ncd/m²) to Foot-lamberts (fL) instantly and accurately.
Conversion Formula
fL = ncd/m² × 2.918635080e-10
About Nanocandelas per square metre
The nanocandela per square metre (ncd/m²) equals 10⁻⁹ cd/m². Represents luminance at the threshold of cooled photomultiplier tubes and avalanche photodiode detectors. The darkest OLED black levels (~10⁻⁴ cd/m²) are still five orders of magnitude brighter; this unit is used in single-photon counting photometry. 1 ncd/m² = 10⁻⁹ cd/m².
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.
Quick Reference Table
| Nanocandelas per square metre (ncd/m²) | Foot-lamberts (fL) |
|---|---|
| 1 ncd/m² | 2.919 × 10-10 fL |
| 2 ncd/m² | 5.837 × 10-10 fL |
| 5 ncd/m² | 1.459 × 10-9 fL |
| 10 ncd/m² | 2.919 × 10-9 fL |
| 25 ncd/m² | 7.297 × 10-9 fL |
| 50 ncd/m² | 1.459 × 10-8 fL |
| 100 ncd/m² | 2.919 × 10-8 fL |