Luminance / asb → cd/m²
Convert Apostilbs to Candelas per square meter
Convert visible-light luminance in candela per projected area. Convert Apostilbs (asb) to Candelas per square meter (cd/m²). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Candelas per square meter to Apostilbs →
How to convert apostilbs to candelas per square meter
Luminance describes directional brightness weighted for human vision. It differs from illuminance on a surface and cannot be converted to lux without geometry.
Use x for the value in asb, b for the intermediate value in cd/m², and y for the result in cd/m².
cd/m² = asb × 0.3183098861837907
Worked examples
10 asb ≈ 3.18309886184 cd/m²
Step 1: (10 × 0.318309886184) ≈ 3.18309886184 cd/m².
Step 2: 3.18309886184 ÷ 1 ≈ 3.18309886184 cd/m².20 asb ≈ 6.36619772368 cd/m²
Step 1: (20 × 0.318309886184) ≈ 6.36619772368 cd/m².
Step 2: 6.36619772368 ÷ 1 ≈ 6.36619772368 cd/m².
Results are rounded to 12 significant digits. Converting units does not increase the precision of the original measurement. Very large or small values outside JavaScript’s finite numeric range are rejected.
About Apostilbs
Apostilbs (asb) measures luminance under the conventions above. The base value in cd/m² is (x × 0.318309886184), where x is the numerical value in asb. Factors shown here are rounded for display; calculations use the stored factor.
About Candelas per square meter
Candelas per square meter (cd/m²) measures luminance under the conventions above. The base value in cd/m² is (x × 1), where x is the numerical value in cd/m². Factors shown here are rounded for display; calculations use the stored factor.
Definitions and sources
Carry the same physical assumptions into subsequent physics calculations.
Apostilbs to candelas per square meter reference table
| Apostilbs (asb) | Candelas per square meter (cd/m²) |
|---|---|
| 1 | 0.318309886184 |
| 5 | 1.59154943092 |
| 10 | 3.18309886184 |
| 25 | 7.95774715459 |
| 50 | 15.9154943092 |
| 100 | 31.8309886184 |
| 1000 | 318.309886184 |
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