Photometry
asbtosb
Convert apostilbs (asb) to stilbs (sb).
Factor1 asb = 3.183099e-5 sb
Converter
asb
Accepts numbers or expressions, e.g. 150 + 14.7
Result
sb
Rendered to 6 significant figures.
Formula
Formula
sb = asb × 3.183099e-5
Multiply any value in apostilbs by 3.183099e-5 to obtain the value in stilbs.
Worked example
Convert 100000 asb to sb.
- 01Start with 100000 asb.
- 02Multiply by the conversion factor: 100000 × 3.183099e-5 = 3.1831 sb.
Result100000 asb = 3.1831 sb
Conversion table
| asb | sb |
|---|---|
| 1 | 3.1831e-5 |
| 2 | 6.3662e-5 |
| 5 | 0.00015915 |
| 10 | 0.00031831 |
| 20 | 0.00063662 |
| 50 | 0.0015915 |
| 100 | 0.0031831 |
| 200 | 0.0063662 |
| 500 | 0.015915 |
| 1000 | 0.031831 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from asb to sb?
1 asb equals 3.183099e-5 sb. To convert, multiply the value in apostilbs by 3.183099e-5.
How do I convert 1 asb to sb?
1 asb = 3.1831e-5 sb. For any value, multiply by 3.183099e-5.
How do I convert sb back to asb?
Divide by the same factor — or equivalently, multiply by 31415.93. So 1 sb = 31415.9 asb.
When would I need to convert apostilb to stilb?
Luminance conversions between asb and sb 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).