Photometry & ImagingApostilbs to Foot Lamberts

Apostilbs to Foot-Lamberts

Methodology·How We Verify

Snapshot

1 Apostilbs equals 0.092903 Foot-Lamberts.

Reference basis: This conversion uses fixed luminance constants anchored to candela per square meter.
Example: For 5 Apostilbs, the result equals 0.464515 Foot-Lamberts.

Interactive conversion

Converter Calculator

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

0.092903 Foot-Lamberts (fL)

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API and AI agent access

Apostilbs to Foot-Lamberts.

Machine-readable identifiers

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

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": "apostilbs",
  "to": "foot_lamberts"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "photometry-imaging",
    "value": 1,
    "from": "apostilbs",
    "to": "foot_lamberts",
    "result": {
      "raw": 0.092903040001,
      "display": "0.092903"
    },
    "canonicalPath": "/photometry-imaging/apostilbs-to-foot-lamberts/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

The converter converts apostilbs into foot-lamberts by normalizing both luminance units through candela per square meter. Formula: fL = asb × 0.092903040001. 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 Apostilbs = 0.092903 Foot-Lamberts.
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

Apostilbs (asb)	Foot-Lamberts (fL)
1	0.092903
5	0.464515
10	0.92903
25	2.322576
50	4.645152
100	9.290304
250	23.22576
500	46.45152
1000	92.90304

Questions & answers

Frequently Asked Questions

Why is Apostilbs to Foot-Lamberts 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 apostilbs to foot-lamberts?

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 Apostilbs to Foot-Lamberts?

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