Convert Foot-lamberts to Stilbs (fL to sb)
1 foot-lambert (fL) = 0.00034262591 stilbs (sb). 1 sb = 2918.63508 fL. Example: 15 fL = 15 × 0.00034262591 = 0.005139388649 sb.
Also searched as foot-lamberts to sb, foot-lamberts in sb, foot-lamberts into stilbs, fL to sb, fL in stilbs, fL into stilb, foot-lambert to stilb, fL to stilbs converter and how many stilbs in a foot-lambert.
1 fL = 0.00034262591 sb
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk foot-lambert to stilb converter to paste a column from Excel.
How to Convert Foot-lambert to Stilb
- 1 fL = 0.00034262591 sb
- 1 sb = 2918.63508 fL
- Example: convert 15 fL to sb: 15 fL = 15 × 0.00034262591 sb = 0.005139388649 sb
Formula
sb = fL × 0.0003426259099635
or sb = fL ÷ 2918.635079602
Derivation from SI units:
- 1 fL = (1/π) cd/ft² ≈ 3.426 cd/m².
- 1 sb = 1 cd/cm² = 10⁴ cd/m².
- 1 fL = 3.426259099635 cd/m² ÷ 10000 cd/m² per sb = 0.0003426259099635 sb
Both units are defined exactly, so the factor is exact. Foot-lambert definition: foot-lambert; Stilb definition: stilb.
Worked examples
- A reading of 10 fL converts to 0.0034262591 sb.
10 fL × 0.00034262591 = 0.0034262591 sb - A value of 22 fL is 0.007537770019 sb.
22 fL × 0.00034262591 = 0.007537770019 sb
Foot-lambert to Stilb conversion table
| Foot-lamberts (fL) | Stilbs (sb) |
|---|---|
| 1 fL | 0.00034262591 sb |
| 4 fL | 0.00137050364 sb |
| 7 fL | 0.00239838137 sb |
| 10 fL | 0.0034262591 sb |
| 14 fL | 0.004796762739 sb |
| 16 fL | 0.005482014559 sb |
| 22 fL | 0.007537770019 sb |
| 30 fL | 0.0102787773 sb |
| 50 fL | 0.0171312955 sb |
| 100 fL | 0.034262591 sb |
Where it's used
Foot-lamberts are used for cinema projection standards (DCI 14 fL), while stilbs appear in older optics and lamp data. Both measure luminance (brightness of a surface or screen), so the conversion is a fixed factor.
Foot-lambert to other luminance units
| Conversion | 1 fL equals |
|---|---|
| foot-lambert to stilb | 0.00034262591 sb |
| foot-lambert to nit | 3.4262591 cd/m² |
| foot-lambert to apostilb | 10.76391042 asb |
| foot-lambert to candela per square foot | 0.3183098862 cd/ft² |
| foot-lambert to candela per square inch | 0.002210485321 cd/in² |
| foot-lambert to lambert | 0.001076391042 L |
Frequently asked questions
How many stilbs are in 1 foot-lambert?
1 fL = 0.00034262591 sb.
How do I convert foot-lamberts to stilbs?
Multiply the value in fL by 0.00034262591, or divide it by 2918.63508. For example, 15 fL × 0.00034262591 = 0.005139388649 sb.
Is the fL to sb conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "footlambert".
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "stilb".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Foot-lamberts to Stilbs (fL to sb). Retrieved October 25, 2026, from https://scientificconverters.com/luminance/foot-lamberts-to-stilbs/
IEEE
Scientific Converters, "Convert Foot-lamberts to Stilbs (fL to sb)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/luminance/foot-lamberts-to-stilbs/