Photometry
asbtoL
Convert apostilbs (asb) to lamberts (L).
Factor1 asb = 0.0001 L
Converter
asb
Accepts numbers or expressions, e.g. 150 + 14.7
Result
L
Rendered to 6 significant figures.
Formula
Formula
L = asb × 0.0001
Multiply any value in apostilbs by 0.0001 to obtain the value in lamberts.
Worked example
Convert 1000 asb to L.
- 01Start with 1000 asb.
- 02Multiply by the conversion factor: 1000 × 0.0001 = 0.1 L.
Result1000 asb = 0.1 L
Conversion table
| asb | L |
|---|---|
| 1 | 0.0001 |
| 2 | 0.0002 |
| 5 | 0.0005 |
| 10 | 0.001 |
| 20 | 0.002 |
| 50 | 0.005 |
| 100 | 0.01 |
| 200 | 0.02 |
| 500 | 0.05 |
| 1000 | 0.1 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from asb to L?
1 asb equals 0.0001 L. To convert, multiply the value in apostilbs by 0.0001.
How do I convert 1 asb to L?
1 asb = 0.0001 L. For any value, multiply by 0.0001.
How do I convert L back to asb?
Divide by the same factor — or equivalently, multiply by 10000. So 1 L = 10000 asb.
When would I need to convert apostilb to lambert?
Luminance conversions between asb and L 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).