Photometry
asbtofL
Convert apostilbs (asb) to foot-lamberts (fL).
Factor1 asb = 0.09290304 fL
Converter
asb
Accepts numbers or expressions, e.g. 150 + 14.7
Result
fL
Rendered to 6 significant figures.
Formula
Formula
fL = asb × 0.09290304
Multiply any value in apostilbs by 0.09290304 to obtain the value in foot-lamberts.
Worked example
Convert 100 asb to fL.
- 01Start with 100 asb.
- 02Multiply by the conversion factor: 100 × 0.09290304 = 9.2903 fL.
Result100 asb = 9.2903 fL
Conversion table
| asb | fL |
|---|---|
| 1 | 0.092903 |
| 2 | 0.18581 |
| 5 | 0.46452 |
| 10 | 0.92903 |
| 20 | 1.8581 |
| 50 | 4.6452 |
| 100 | 9.2903 |
| 200 | 18.581 |
| 500 | 46.452 |
| 1000 | 92.903 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from asb to fL?
1 asb equals 0.09290304 fL. To convert, multiply the value in apostilbs by 0.09290304.
How do I convert 1 asb to fL?
1 asb = 0.092903 fL. For any value, multiply by 0.09290304.
How do I convert fL back to asb?
Divide by the same factor — or equivalently, multiply by 10.76391. So 1 fL = 10.7639 asb.
When would I need to convert apostilb to foot-lambert?
Luminance conversions between asb 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).