Convert Foot-lamberts to Nanocandelas per square metre
Convert Foot-lamberts (fL) to Nanocandelas per square metre (ncd/m²) instantly and accurately.
Conversion Formula
ncd/m² = fL × 3426259100
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 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.
Quick Reference Table
| Foot-lamberts (fL) | Nanocandelas per square metre (ncd/m²) |
|---|---|
| 1 fL | 3.426 × 109 ncd/m² |
| 2 fL | 6.853 × 109 ncd/m² |
| 5 fL | 1.713 × 1010 ncd/m² |
| 10 fL | 3.426 × 1010 ncd/m² |
| 25 fL | 8.566 × 1010 ncd/m² |
| 50 fL | 1.713 × 1011 ncd/m² |
| 100 fL | 3.426 × 1011 ncd/m² |