Overview
ISO/TS 21274:2020 - "Light and lighting - Commissioning of lighting systems in buildings" defines minimum requirements and best-practice processes for the commissioning of lighting systems to ensure installed systems meet design specifications. It applies to new installations in non-residential buildings and public spaces of multi-residence buildings. The technical specification focuses on commissioning activities, roles, documentation and handover rather than the detailed technical characteristics of specific lighting components. It does not cover emergency lighting commissioning or electrical power-connection compliance, which are assumed to meet applicable legislation or standards.
Key topics and requirements
- Commissioning scope and objectives
- Verify that lighting systems operate according to design intent and performance criteria.
- Ensure components are correctly installed, configured and calibrated.
- Commissioning methods
- Method 1 - Basic: commissioning between installation and operation to confirm correct installation, calibration and configuration.
- Method 2 - Full life‑cycle: involvement of the commissioning team from design through post‑occupancy for continuous verification.
- Phases and activities
- Pre-commissioning, installation, field commissioning and post-occupancy verification.
- Verification tasks include luminaire aiming, local control operation, system-wide functionality and interactions with daylighting or other building systems.
- Roles and responsibilities
- Defined responsibilities for owner/tenant, design team, contractors/suppliers and the commissioning team (Cx team).
- Documentation and deliverables
- Required documents include a commissioning plan (Cx plan), commissioning specification, observation/inspection and calibration reports, issues log, training plan and final commissioning report.
- Acceptance and handover
- Formal acceptance steps for each deliverable as defined in the Cx plan; owner/tenant acceptance required for contractual completion.
Applications and users
ISO/TS 21274 is practical for:
- Building owners and facility managers who need verified lighting performance and documented handover.
- Lighting designers and electrical/design teams specifying commissionable systems and control strategies.
- Contractors, integrators and suppliers responsible for installation, calibration and commissioning activities.
- Commissioning agents and consultants executing Method 1 or Method 2 commissioning for commercial, institutional and public-space lighting projects.
Benefits include improved energy performance, higher occupant satisfaction, reduced operating costs and clearer accountability for project participants.
Related standards
- ISO 52000‑1 - Energy performance of buildings - overarching EPB assessment (referenced normative document).
- CIE DIS 017 - International Lighting Vocabulary (terminology referenced).
- Prepared by ISO/TC 274 (Light and lighting).
Keywords: ISO/TS 21274, commissioning of lighting systems, lighting commissioning, commissioning plan, lighting systems in buildings, lighting controls, calibration, commissioning team.