IlluminanceLux to Phot

Lux to Phot

Methodology·How We Verify

Snapshot

1 Lux equals 0.0001 Phot.

Reference basis: This conversion uses exact lux-based illuminance definitions.
Example: For 10 Lux, the result equals 0.001 Phot.

Interactive conversion

Converter Calculator

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

0.0001 Phot (ph)

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API and AI agent access

Lux to Phot.

Machine-readable identifiers

Conversion family: illuminance
Source unit: lux
Target unit: phot

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": "illuminance",
  "value": 1,
  "from": "lux",
  "to": "phot"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "illuminance",
    "value": 1,
    "from": "lux",
    "to": "phot",
    "result": {
      "raw": 0.0001,
      "display": "0.0001"
    },
    "canonicalPath": "/illuminance/lux-to-phot/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

Multiply by 0.0001 because 1 lx = 1 lux and 1 ph = 10000 lux.

Method & Reference

Method basis: exact conversion formula shown in Snapshot.
Applied factor: 1 Lux = 0.0001 Phot (using exact lux-based illuminance definitions).
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

Lux (lx)	Phot (ph)
1	0.0001
10	0.001
50	0.005
100	0.01
300	0.03
500	0.05
1000	0.1
10000	1

Questions & answers

Frequently Asked Questions

What is 1 lux in phot?

1 Lux equals 0.0001 Phot on this page.

Does this Lux to Phot page use the exact lux relationship for phot?

Yes. Phot routes use the exact relationship 1 phot = 10,000 lux through one lux normalization path, so CGS and modern lighting references stay consistent across the page.

When would I convert lux to phot?

This route is useful when comparing phot-based CGS illuminance values against modern lux-based references in laboratory, optical, and legacy technical material.

How do I reverse Lux to Phot?

Use the mirror Phot to Lux route; it applies the inverse relationship with the same illuminance assumptions.