Foot-lambert (fL)
1/π candela per square foot. Used for cinema screen brightness.
What is a foot-lambert?
- Symbol
- fL
- Quantity
- Luminance
- Unit system
- US customary
- Definition
- 1/π candela per square foot. Used for cinema screen brightness.
- Exact
- Yes, the value is exact by definition
- Source
- NIST Special Publication 811 (2008), Appendix B.8
Common applications
Used in the cinema industry for projection screen brightness, and in US aviation and display specifications.
Foot-lambert in other luminance units
- 1 fL ≈ 3.4262591 cd/m²Foot-lambert to Candela per square meter (nit) converter
- 1 fL ≈ 0.0034262591 kcd/m²Kilocandela per square meter
- 1 fL ≈ 0.00034262591 sbStilb
- 1 fL ≈ 0.3183098862 cd/ft²Candela per square foot
- 1 fL ≈ 0.002210485321 cd/in²Candela per square inch
- 1 fL ≈ 0.001076391042 LaLambert
- 1 fL ≈ 10.76391042 asbApostilb
Foot-lambert quick reference
| Foot-lambert | Candela per square meter (nit) | Kilocandela per square meter | Stilb |
|---|---|---|---|
| 1 fL | ≈ 3.4262591 cd/m² | ≈ 0.0034262591 kcd/m² | ≈ 0.00034262591 sb |
| 10 fL | ≈ 34.262591 cd/m² | ≈ 0.034262591 kcd/m² | ≈ 0.0034262591 sb |
| 100 fL | ≈ 342.62591 cd/m² | ≈ 0.34262591 kcd/m² | ≈ 0.034262591 sb |
| 1000 fL | ≈ 3426.2591 cd/m² | ≈ 3.4262591 kcd/m² | ≈ 0.34262591 sb |
Where the foot-lambert fits
The next smaller luminance unit is the candela per square meter (cd/m²). 1 fL ≈ 3.4262591 cd/m², and 1 cd/m² ≈ 0.291863508 fL.
The next larger luminance unit is the candela per square foot (cd/ft²). 1 fL ≈ 0.3183098862 cd/ft², and 1 cd/ft² ≈ 3.141592654 fL.
Frequently asked questions
- How many candelas per square meter are in one foot-lambert?
- One foot-lambert ≈ 3.4262591 cd/m² (candelas per square meter).
- How many kilocandelas per square meter are in one foot-lambert?
- One foot-lambert ≈ 0.0034262591 kcd/m² (kilocandelas per square meter).
- How many stilbs are in one foot-lambert?
- One foot-lambert ≈ 0.00034262591 sb (stilbs).