Photometry & ImagingLamberts to Apostilbs

Lamberts to Apostilbs

Snapshot

1 Lamberts equals 10,000 Apostilbs. Conversion Encyclopedia uses the same fixed conversion basis across the calculator, common values, and reverse page for this page.

Reference basis: This conversion uses fixed luminance constants anchored to candela per square meter.
Example: For 5 Lamberts, the result equals 50,000 Apostilbs.
Use the reverse page if you need the opposite direction with the same basis.

Use the interactive calculator below for custom values and the common-value table for quick checks.

Interactive conversion

Converter Calculator

10,000 Apostilbs (asb)

Switch

Machine access

Available to apps and AI agents

Lamberts to Apostilbs can be requested through Conversion Encyclopedia's structured interfaces by software and compatible AI agents. The identifiers below select the same calculation as the calculator.

Machine-readable identifiers

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

The JSON API and OpenAPI specification use the identifiers to reach the conversion engine. WebMCP lets compatible AI agents request the same calculation.

Example API request and response

POST /api/v1/convert

Request

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

Essential response

{
  "ok": true,
  "conversion": {
    "family": "photometry-imaging",
    "value": 1,
    "from": "lamberts",
    "to": "apostilbs",
    "result": {
      "raw": 10000,
      "display": "10,000"
    },
    "canonicalPath": "/photometry-imaging/lamberts-to-apostilbs/"
  }
}

Full API documentation

Explanation

This page converts Lamberts into Apostilbs using fixed luminance constants anchored to candela per square meter. The direct answer, calculator, and common values table all follow the same factor.

Formula: Apostilbs = Lamberts × 10,000. Why: legacy luminance units such as foot-lamberts, lamberts, apostilbs, and stilbs each use fixed cd/m² equivalents, so the calculator normalizes through candela per square meter before applying the target unit.

Lamberts (L): a legacy luminance unit with a fixed candela-per-square-meter equivalent.

Apostilbs (asb): a legacy luminance unit tied to a fixed candela-per-square-meter equivalent.

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

Because the route stays inside one cd/m2-based luminance model, the mirror page reverses the same constants without changing the underlying assumptions.

Method & Luminance Basis

Method basis: both units reduce through candela per square meter, then apply the fixed target-unit luminance relationship.
Applied factor: 1 Lamberts = 10,000 Apostilbs.
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

Lamberts (L)	Apostilbs (asb)
1	10,000
5	50,000
10	100,000
25	250,000
50	500,000
100	1,000,000
250	2,500,000
500	5,000,000
1,000	10,000,000

Questions & answers

Frequently Asked Questions

How many apostilbs are in 1 lamberts?

1 Lamberts equals 10,000 Apostilbs on this page.

Why is 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 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 Lamberts to Apostilbs?

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