Photometry
LtofL
Convert lamberts (L) to foot-lamberts (fL).
Factor1 L = 929.0304 fL
Converter
L
Accepts numbers or expressions, e.g. 150 + 14.7
Result
fL
Rendered to 6 significant figures.
Formula
Formula
fL = L × 929.0304
Multiply any value in lamberts by 929.0304 to obtain the value in foot-lamberts.
Worked example
Convert 1 L to fL.
- 01Start with 1 L.
- 02Multiply by the conversion factor: 1 × 929.0304 = 929.03 fL.
Result1 L = 929.03 fL
Conversion table
| L | fL |
|---|---|
| 1 | 929.03 |
| 2 | 1858.1 |
| 5 | 4645.2 |
| 10 | 9290.3 |
| 20 | 18581 |
| 50 | 46452 |
| 100 | 92903 |
| 200 | 1.8581e+5 |
| 500 | 4.6452e+5 |
| 1000 | 9.2903e+5 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from L to fL?
1 L equals 929.0304 fL. To convert, multiply the value in lamberts by 929.0304.
How do I convert 1 L to fL?
1 L = 929.03 fL. For any value, multiply by 929.0304.
How do I convert fL back to L?
Divide by the same factor — or equivalently, multiply by 0.001076391. So 1 fL = 0.00107639 L.
When would I need to convert lambert to foot-lambert?
Luminance conversions between L 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).