Photometry & ImagingFoot Lamberts to Apostilbs

Foot-Lamberts to Apostilbs

Methodology·How We Verify

Snapshot

1 Foot-Lamberts equals 10.76391 Apostilbs.

Reference basis: This conversion uses fixed luminance constants anchored to candela per square meter.
Example: For 5 Foot-Lamberts, the result equals 53.819552 Apostilbs.

Interactive conversion

Converter Calculator

Decimals: 1.5 or 1,5. Fractions: 1/2. Scientific notation: 1e3. Write 1000 without grouping separators.

10.76391 Apostilbs (asb)

Switch

API and AI agent access

Foot-Lamberts to Apostilbs.

Machine-readable identifiers

Conversion family: photometry-imaging
Source unit: foot_lamberts
Target unit: apostilbs

Use these identifiers in the API request. Sources and model limits also apply to software clients.

Example API request and response

POST /api/v1/convert

Request

{
  "family": "photometry-imaging",
  "value": 1,
  "from": "foot_lamberts",
  "to": "apostilbs"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "photometry-imaging",
    "value": 1,
    "from": "foot_lamberts",
    "to": "apostilbs",
    "result": {
      "raw": 10.7639104166,
      "display": "10.76391"
    },
    "canonicalPath": "/photometry-imaging/foot-lamberts-to-apostilbs/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

The converter converts foot-lamberts into apostilbs by normalizing both luminance units through candela per square meter. Formula: asb = fL × 10.7639104166. That keeps the snapshot, calculator, common values, and mirror page aligned on one luminance basis.

This is useful for display brightness checks, projection calibration, and imaging workflows where legacy photometric units and modern cd/m²-based measurements need to match cleanly.

Method & Luminance Basis

Method basis: both units reduce through candela per square meter, then apply the fixed target-unit luminance relationship.
Applied factor: 1 Foot-Lamberts = 10.76391 Apostilbs.
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

Foot-Lamberts (fL)	Apostilbs (asb)
1	10.76391
5	53.819552
10	107.639104
25	269.09776
50	538.195521
100	1,076.391042
250	2,690.977604
500	5,381.955208
1000	10,763.910417

Questions & answers

Frequently Asked Questions

Why is Foot-Lamberts to Apostilbs useful in display and projection work?

This route is useful when comparing modern display-brightness values with legacy luminance units used in cinema, projection, calibration, and older imaging references.

When would I convert foot-lamberts to apostilbs?

This route is useful when comparing modern display-brightness values with legacy luminance units used in projection, cinema, and older photometric references.

How do I reverse Foot-Lamberts to Apostilbs?

Use the mirror Apostilbs to Foot-Lamberts route; it applies the inverse relationship with the same cd/m²-based luminance assumptions.