Convert Stilbs to Lamberts (sb to L)
1 stilb (sb) = 3.141592654 lamberts (L). 1 L = 0.3183098862 sb. Example: 15 sb = 15 × 3.141592654 = 47.1238898 L.
Also searched as stilbs to L, stilbs in L, stilbs into lamberts, sb to L, sb in lamberts, sb into lambert, stilb to lambert, sb to lamberts converter and how many lamberts in a stilb.
1 sb = 3.141592654 L
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk stilb to lambert converter to paste a column from Excel.
How to Convert Stilb to Lambert
- 1 sb = 3.141592654 L
- 1 L = 0.3183098862 sb
- Example: convert 15 sb to L: 15 sb = 15 × 3.141592654 L = 47.1238898 L
Formula
L = sb × 3.14159265359
Derivation from SI units:
- 1 sb = 1 cd/cm² = 10⁴ cd/m².
- 1 L = (1/π) cd/cm² ≈ 3183 cd/m².
- 1 sb = 10000 cd/m² ÷ 3183.098861838 cd/m² per L = 3.14159265359 L
Both units are defined exactly, so the factor is exact. Stilb definition: stilb; Lambert definition: lambert.
Worked examples
- A reading of 2 sb converts to 6.283185307 L.
2 sb × 3.141592654 = 6.283185307 L - A value of 20 sb is 62.83185307 L.
20 sb × 3.141592654 = 62.83185307 L
Stilb to Lambert conversion table
| Stilbs (sb) | Lamberts (L) |
|---|---|
| 0.1 sb | 0.3141592654 L |
| 0.5 sb | 1.570796327 L |
| 1 sb | 3.141592654 L |
| 2 sb | 6.283185307 L |
| 5 sb | 15.70796327 L |
| 10 sb | 31.41592654 L |
| 20 sb | 62.83185307 L |
| 50 sb | 157.0796327 L |
| 100 sb | 314.1592654 L |
| 1000 sb | 3141.592654 L |
Where it's used
Stilbs are used for older optics and lamp data, while lamberts appear in older vision-science literature. Both measure luminance (brightness of a surface or screen), so the conversion is a fixed factor.
Stilb to other luminance units
| Conversion | 1 sb equals |
|---|---|
| stilb to lambert | 3.141592654 L |
| stilb to nit | 10000 cd/m² |
| stilb to foot-lambert | 2918.63508 fL |
| stilb to apostilb | 31415.92654 asb |
| stilb to candela per square foot | 929.0304 cd/ft² |
| stilb to candela per square inch | 6.4516 cd/in² |
Frequently asked questions
How many lamberts are in 1 stilb?
1 sb = 3.141592654 L.
How do I convert stilbs to lamberts?
Multiply the value in sb by 3.141592654. For example, 15 sb × 3.141592654 = 47.1238898 L.
Is the sb to L 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, "stilb".
- 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, "lambert".
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 Stilbs to Lamberts (sb to L). Retrieved October 25, 2026, from https://scientificconverters.com/luminance/stilbs-to-lamberts/
IEEE
Scientific Converters, "Convert Stilbs to Lamberts (sb to L)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/luminance/stilbs-to-lamberts/