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illuminance

luminous flux incident on a surface per area
Thing general Q194411
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illuminance

Summary

illuminance ranks in the top 2% of general entities by monthly Wikipedia readership (639 views/month).[1]

Key Facts

  • illuminance is a type of physical quantity[2].
  • illuminance is a type of scalar quantity[3].
  • illuminance is a type of photometric quantity[4].
  • illuminance's Commons category is recorded as Illuminance[5].
  • illuminance's described by source is recorded as ISO 80000-7:2019 Quantities and units — Part 7: Light and radiation[6].
  • illuminance's described by source is recorded as Principles governing photometry (2nd edition)[7].
  • illuminance's different from is recorded as luminance[8].
  • illuminance's maintained by WikiProject is recorded as WikiProject Mathematics[9].
  • illuminance's recommended unit of measurement is recorded as lux[10].
  • illuminance's recommended unit of measurement is recorded as candela steradian per square metre[11].

Body

Definition and Type

Recorded subclass of include physical quantity[2], scalar quantity[3], and photometric quantity[4].

Why It Matters

illuminance ranks in the top 2% of general entities by monthly Wikipedia readership (639 views/month).[1] illuminance has Wikipedia articles in 23 language editions, a strong signal of global cultural recognition.[12] illuminance is known by 17 alternative names across languages and contexts.[13]

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [2] ↑ . wikidata.org.
  2. [3] ↑ . wikidata.org.
  3. [4] ↑ . wikidata.org.
  4. [5] ↑ . wikidata.org.
  5. [6] ↑ . wikidata.org.
  6. [7] ↑ . wikidata.org.
  7. [8] ↑ . wikidata.org.
  8. [9] ↑ . wikidata.org.
  9. [10] ↑ . ISO 80000-7:2019 Quantities and units — Part 7: Light and radiation. wikidata.org.
  10. [11] ↑ . ISO 80000-7:2019 Quantities and units — Part 7: Light and radiation. wikidata.org.

Aggregate / graph-position facts

  1. [1] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [12] ↑ . Wikidata sitelinks. wikidata.org.
  3. [13] ↑ . Wikidata aliases. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). illuminance. Retrieved April 10, 2026, from https://4ort.xyz/entity/illuminance
MLA “illuminance.” 4ort.xyz Knowledge Graph, 4ort.xyz, 10 Apr. 2026, https://4ort.xyz/entity/illuminance.
BibTeX @misc{4ortxyz_illuminance_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{illuminance}}, year = {2026}, url = {https://4ort.xyz/entity/illuminance}, note = {Accessed: 2026-04-10}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): illuminance — https://4ort.xyz/entity/illuminance (retrieved 2026-04-10)

Canonical URL: https://4ort.xyz/entity/illuminance · Last refreshed:

Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 5w ago · Nyuhn · 2026-07-10 view diff on Wikidata ↗
    Maintained by wikiproject → WikiProject Mathematics
    Different from → luminance
    Subclass of → —
    Described by source → ISO 80000-7:2019 Quantities and units — Part 7: Light and radiation, Principles governing photometry (2nd edition)
    + 4 other properties edited (see Wikidata diff for full list)
    "/* wbeditentity-update:0| */ QuickStatements 3.0 [[:toollabs:qs-dev/batch/40849|batch #40849]]: ZGBK ID"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.