Building Code Glossary
Luminaire: Building Code Definition
How the IRC 2009 define luminaire, where the wording differs, and which chapters depend on the term.
On this page
Last updated September 7, 2026 · Definitions quoted from the 2009 International Codes as transcribed in this site's building-codes collection, with the source chapter linked for each quotation. Usage counts are computed over the chapters hosted here, one copy per code. The [ICC code library](https://codes.iccsafe.org/codes) publishes the current model text and the [ICC adoption maps](https://www.iccsafe.org/advocacy/code-adoption-maps/) show which edition a jurisdiction has adopted; those sources control.
Direct answer
Luminaire is a defined term in the International Residential Code (IRC) 2009, in Electrical Definitions. The code's own words are: “A complete lighting unit consisting of a light source such as a lamp or lamps together with the parts designed to position the light source and connect it to the power supply. A luminaire can include parts to protect the light source or the ballast or to distribute the light. A lampholder itself is not …” No other I-Code in this corpus defines it, so the IRC 2009 definition is the one to work from. The term is used in 21 chapters of this corpus, most often in Swimming Pools (IRC 2009), Devices and Luminaires (IRC 2009), Power and Lighting Distribution (IRC 2009). These pages transcribe the 2009 model text; verify the definition against the edition and amendments your authority having jurisdiction has adopted.
Content and cited inputs reviewed by Scott Barrington, Harth founder and architectural technology specialist · Published 2026-09-07 · Updated 2026-09-07.
What does this term mean?
Luminaire — IRC 2009, Electrical Definitions:
A complete lighting unit consisting of a light source such as a lamp or lamps together with the parts designed to position the light source and connect it to the power supply. A luminaire can include parts to protect the light source or the ballast or to distribute the light. A lampholder itself is not a luminaire.
What must be verified before using this guidance?
Luminaire is defined once in this corpus, in the Electrical Definitions chapter of the International Residential Code (IRC) 2009:
A complete lighting unit consisting of a light source such as a lamp or lamps together with the parts designed to position the light source and connect it to the power supply. A luminaire can include parts to protect the light source or the ballast or to distribute the light. A lampholder itself is not a luminaire.
Where luminaire is used in the code
The term appears in 21 chapters of the 2009 I-Codes hosted here. The chapters that lean on it hardest are the ones to read next.
| Chapter | Code | Mentions |
|---|---|---|
| Swimming Pools | IRC 2009 | 137 |
| Devices and Luminaires | IRC 2009 | 84 |
| Power and Lighting Distribution | IRC 2009 | 54 |
| Commercial Energy Efficiency | IECC 2009 | 49 |
| Flammable Finishes | IFC 2009 | 35 |
| Water Supply and Distribution | IRC 2009 | 10 |
| Electrical Definitions | IRC 2009 | 7 |
| Administration | IECC 2009 | 6 |
| Residential Energy Efficiency | IECC 2009 | 6 |
| Building Services and Systems | IFC 2009 | 6 |
| Energy Efficiency | IRC 2009 | 6 |
| General Mechanical System Requirements | IRC 2009 | 6 |
9 further chapters mention the term.
The term in use
How the code actually writes about luminaire, quoted from the 2009 text hosted here:
In outdoor pool, outdoor spas and outdoor hot tubs areas, luminaires, lighting outlets, and ceiling-suspended paddle fans shall not be installed over the pool or over the area extending 5 feet (1524 mm) horizontally from the inside walls of a pool except where no part of the luminaire or ceiling-suspended paddle fan is less than 12 feet (3658 mm) above …
The ballast of a fluorescent luminaire installed indoors shall have integral thermal protection.
Where a luminaire is listed to be used as a raceway, a box or conduit body shall not be required for wiring installed therein.
The terms luminaire is built out of
The definition above leans on 1 other defined term. Each carries its own code definition, and a local amendment to any of them changes what luminaire covers:
- Ballast — IBC 2009: In roofing, ballast comes in the form of large stones or paver systems or light-weight interlocking paver systems and is used to provide uplift resistance for roofing systems that are not adhered or mechanically attached to the roof deck.
Luminaire: what to open, and in what order
Every row is a document this term depends on. The ICC code library and the ICC adoption maps cover the middle rows.
| Check | Where | Confirmed |
|---|---|---|
| Read the definition in the adopted IRC | Electrical Definitions | |
| Re-check the requirement that uses it | Swimming Pools (IRC 2009) | |
| Re-check the requirement that uses it | Devices and Luminaires (IRC 2009) | |
| Re-check the requirement that uses it | Power and Lighting Distribution (IRC 2009) | |
| Re-check the requirement that uses it | Commercial Energy Efficiency (IECC 2009) | |
| Confirm the dependent definition | Ballast | |
| Local amendment to any of the above | Jurisdiction's amendment list |
A research aid, not a code determination. The authority having jurisdiction decides which edition and which amendments apply.
Where can you explore related guidance?
- Explore all glossary guidance
- Ballast: Building Code Definition
- Appliance: Building Code Definition
- Plenum: Building Code Definition
- Outlet: Building Code Definition
Sources and method
Definitions quoted from the 2009 International Codes as transcribed in this site's building-codes collection, with the source chapter linked for each quotation. Usage counts are computed over the chapters hosted here, one copy per code. The ICC code library publishes the current model text and the ICC adoption maps show which edition a jurisdiction has adopted; those sources control.
Source links
Frequently asked questions
What is the code definition of luminaire?
The International Residential Code (IRC) 2009 defines it in Electrical Definitions as: “A complete lighting unit consisting of a light source such as a lamp or lamps together with the parts designed to position the light source and connect it to the power supply. A luminaire can include parts to protect the light source or the ballast or to distribute the light. A lampholder itself is not a luminaire.” The 2009 model text is reproduced here; the definition that binds your project is the one in the edition your jurisdiction has adopted, as amended locally.
Which parts of the code depend on luminaire?
In this corpus the term is used across 21 chapters, led by Swimming Pools in the IRC 2009. Those are the sections whose scope moves if the definition is amended locally, so read them together with Chapter 2 rather than on their own.
What is considered a luminaire?
In the 2009 I-Codes hosted here it is a defined term rather than a description. The IRC 2009 states, in Electrical Definitions: “A complete lighting unit consisting of a light source such as a lamp or lamps together with the parts designed to position the light source and connect it to the power supply. A luminaire can include parts to protect the light source or the ballast or to distribute the light. A lampholder itself is not …” It is defined in IRC 2009. Because it is a defined term, whatever the adopted edition says it means is what every section using it means — so check Chapter 2 of that edition and any local amendment before relying on this wording.
What does IRC mean in building code?
Building is a separate defined term. The IBC 2009 defines it as: “Any structure used or intended for supporting or sheltering any use or occupancy.” That is not the same as luminaire, which the IRC 2009 defines as “A complete lighting unit consisting of a light source such as a lamp or lamps together with the parts designed to position the light source and connect it to the power supply. A luminaire can include parts to protect the …” — read both before applying either, and confirm the wording in the edition your jurisdiction has adopted.
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