Photometry
sbtofL
Convert stilbs (sb) to foot-lamberts (fL).
Factor1 sb = 2918.635 fL
Converter
sb
Accepts numbers or expressions, e.g. 150 + 14.7
Result
fL
Rendered to 6 significant figures.
Formula
Formula
fL = sb × 2918.635
Multiply any value in stilbs by 2918.635 to obtain the value in foot-lamberts.
Worked example
Convert 1 sb to fL.
- 01Start with 1 sb.
- 02Multiply by the conversion factor: 1 × 2918.635 = 2918.64 fL.
Result1 sb = 2918.64 fL
Conversion table
| sb | fL |
|---|---|
| 1 | 2918.6 |
| 2 | 5837.3 |
| 5 | 14593 |
| 10 | 29186 |
| 20 | 58373 |
| 50 | 1.4593e+5 |
| 100 | 2.9186e+5 |
| 200 | 5.8373e+5 |
| 500 | 1.4593e+6 |
| 1000 | 2.9186e+6 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from sb to fL?
1 sb equals 2918.635 fL. To convert, multiply the value in stilbs by 2918.635.
How do I convert 1 sb to fL?
1 sb = 2918.64 fL. For any value, multiply by 2918.635.
How do I convert fL back to sb?
Divide by the same factor — or equivalently, multiply by 0.0003426259. So 1 fL = 0.000342626 sb.
When would I need to convert stilb to foot-lambert?
Luminance conversions between sb and fL 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).