Photometry
fLtont
Convert foot-lamberts (fL) to nits (nt).
Factor1 fL = 3.426259 nt
Converter
fL
Accepts numbers or expressions, e.g. 150 + 14.7
Result
nt
Rendered to 6 significant figures.
Formula
Formula
nt = fL × 3.426259
Multiply any value in foot-lamberts by 3.426259 to obtain the value in nits.
Worked example
Convert 100 fL to nt.
- 01Start with 100 fL.
- 02Multiply by the conversion factor: 100 × 3.426259 = 342.626 nt.
Result100 fL = 342.626 nt
Conversion table
| fL | nt |
|---|---|
| 1 | 3.4263 |
| 2 | 6.8525 |
| 5 | 17.131 |
| 10 | 34.263 |
| 20 | 68.525 |
| 50 | 171.31 |
| 100 | 342.63 |
| 200 | 685.25 |
| 500 | 1713.1 |
| 1000 | 3426.3 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from fL to nt?
1 fL equals 3.426259 nt. To convert, multiply the value in foot-lamberts by 3.426259.
How do I convert 1 fL to nt?
1 fL = 3.42626 nt. For any value, multiply by 3.426259.
How do I convert nt back to fL?
Divide by the same factor — or equivalently, multiply by 0.2918635. So 1 nt = 0.291864 fL.
When would I need to convert foot-lambert to nit?
Luminance conversions between fL and nt 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).