Photometry
fLtosb
Convert foot-lamberts (fL) to stilbs (sb).
Factor1 fL = 0.0003426259 sb
Converter
fL
Accepts numbers or expressions, e.g. 150 + 14.7
Result
sb
Rendered to 6 significant figures.
Formula
Formula
sb = fL × 0.0003426259
Multiply any value in foot-lamberts by 0.0003426259 to obtain the value in stilbs.
Worked example
Convert 10000 fL to sb.
- 01Start with 10000 fL.
- 02Multiply by the conversion factor: 10000 × 0.0003426259 = 3.42626 sb.
Result10000 fL = 3.42626 sb
Conversion table
| fL | sb |
|---|---|
| 1 | 0.00034263 |
| 2 | 0.00068525 |
| 5 | 0.0017131 |
| 10 | 0.0034263 |
| 20 | 0.0068525 |
| 50 | 0.017131 |
| 100 | 0.034263 |
| 200 | 0.068525 |
| 500 | 0.17131 |
| 1000 | 0.34263 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from fL to sb?
1 fL equals 0.0003426259 sb. To convert, multiply the value in foot-lamberts by 0.0003426259.
How do I convert 1 fL to sb?
1 fL = 0.000342626 sb. For any value, multiply by 0.0003426259.
How do I convert sb back to fL?
Divide by the same factor — or equivalently, multiply by 2918.635. So 1 sb = 2918.64 fL.
When would I need to convert foot-lambert to stilb?
Luminance conversions between fL and sb are used in display engineering, road and traffic-signal design, and photometric measurement of luminous surfaces. cd/m² (nit) is the SI standard; foot-lambert and stilb appear in legacy datasheets and specialist optics work.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).