IlluminancePhot to Lux

Phot to Lux

Methodology·How We Verify

Snapshot

1 Phot equals 10,000 Lux.

Reference basis: This conversion uses exact lux-based illuminance definitions.
Example: For 10 Phot, the result equals 100,000 Lux.

Interactive conversion

Converter Calculator

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

10,000 Lux (lx)

Switch

API and AI agent access

Phot to Lux.

Machine-readable identifiers

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

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": "phot",
  "to": "lux"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "illuminance",
    "value": 1,
    "from": "phot",
    "to": "lux",
    "result": {
      "raw": 10000,
      "display": "10,000"
    },
    "canonicalPath": "/illuminance/phot-to-lux/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

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

Method & Reference

Method basis: exact conversion formula shown in Snapshot.
Applied factor: 1 Phot = 10,000 Lux (using exact lux-based illuminance definitions).
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

Phot (ph)	Lux (lx)
1	10,000
10	100,000
50	500,000
100	1,000,000
300	3,000,000
500	5,000,000
1000	10,000,000
10000	100,000,000

Questions & answers

Frequently Asked Questions

What is 1 phot in lux?

1 Phot equals 10,000 Lux on this page.

Does this Phot to Lux 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 phot to lux?

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 Phot to Lux?

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