{"id":"lighting-led-interior","version":"0.3.0","classification":{"uniformat":"D5020"},"names":["Interior lighting, LED"],"aliases":["LED fixture","light fixture","luminaire"],"service_life":{"median_years":25,"range_years":[10,30],"range_basis":"source_spread"},"pm_tasks":[{"task":"Inspect fixtures and controls for dirt, degraded lenses and faulty controls","frequency":"P6M","reference":"Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency, Release 3.0","url":"https://www.energy.gov/sites/default/files/2020/04/f74/omguide_complete_w-eo-disclaimer.pdf","page":284,"checklist":"9.12.6 Lighting Checklist"}],"basis":[{"type":"public_document","life_type":"planning","title":"CNA e-Tool Estimated Useful Life Table","by":"U.S. Department of Housing and Urban Development","url":"https://www.hud.gov/sites/documents/eul_for_cna_e_tool.pdf","page":14,"code":"HUD CNA 3.4.4.3.3","label":"Lighting- interior common space","years":[25,30],"note":"Family properties 25 years, elderly 30. US multifamily housing. HUD's row is interior common-space lighting and does not name the lamp technology."},{"type":"public_document","life_type":"design","title":"Design standards: employer's requirements – Technical Manual (ER-DFE-XX-XX-T-X-0201, revision A-C01)","by":"Department for Education (England)","url":"https://assets.publishing.service.gov.uk/media/6971f649d8adeaf266040501/ER-DFE-XX-XX-T-X-0201-Technical_Manual-A-C01.pdf","page":294,"code":"5.8.4","label":"Internal luminaires, emergency lighting fittings and lighting controls: 25 years","years":25,"note":"Printed page 294. Interior LED luminaires (LED required, p.302) and emergency lighting fittings; batteries dealt with separately (5.8.15). Minimum life expectancy (design requirement) for DfE-funded school buildings. Minimum design requirements placed on contractors for school buildings, not observed replacement ages. Section 5.1.4 (sanitaryware) refers to CIBSE Guide M Appendix 12.A1 'in general'."},{"type":"public_document","life_type":"accounting","title":"General depreciation rates (IR265), July 2021","by":"Inland Revenue (Te Tari Taake), New Zealand","url":"https://www.ird.govt.nz/-/media/project/ir/home/documents/forms-and-guides/ir200---ir299/ir265/ir265-2021.pdf","page":43,"code":"BDFO","label":"Light fittings","years":10,"note":"Printed page 43. Light fittings, lamp type not stated; building fit-out so interior. BDFO Building fit-out (when in books separately from building cost). Printed DV 20%, SL 13.5%. Tax depreciation lives set by the Commissioner of Inland Revenue for New Zealand income tax, not engineering or asset-management lives; they are banded and often short (e.g. reticulation piping 25 years). The July 2021 edition was the newest PDF reachable; the online Depreciation Rate Finder may hold later determinations."},{"type":"public_document","life_type":"planning","title":"Future Buildings Standard: final stage impact assessment (RPC-MHCLG-25104-IA), 24 March 2026","by":"Ministry of Housing, Communities and Local Government (UK)","url":"https://assets.publishing.service.gov.uk/media/69c16a6113101e9908704acb/Future_Buildings_Standard_Impact_Assessment.pdf","page":77,"code":"Appendix B","label":"\"20 years for light fittings and ventilation equipment\"","years":20,"note":"Printed page 77. One value for two groups. Light fittings in new buildings are LED (the IA applies LED cost learning). 'Ventilation equipment' is generic; mapped to the ventilation component types it clearly includes. Assumption for new non-domestic buildings in England; the IA says the lifetimes are in line with BS EN 15459 (Annex/Appendix E), but they are stated as the department's own modelling assumptions, not a reproduced table. Round-number economic-appraisal assumptions, not observed lives. Same values as the January 2021 Future Buildings Standard consultation IA (separate file), so the two are not independent."}],"confidence":{"grade":"C","sample_size":null},"open_questions":["HUD's row is interior common-space lighting in general and does not name the technology; LED drivers and modules often fail before the fixture body. A source specific to LED fixtures is needed.","Every source here is a published planning, design or accounting life. None is observed replacement data."],"contributors":["unfinished.one editors"],"last_reviewed":"2026-10-22","canonical_url":"https://unfinished.one/c/lighting-led-interior","versioned_url":"https://unfinished.one/c/lighting-led-interior/v/0.3.0","licence":"CC-BY-4.0","citation":"unfinished.one (2026). Interior lighting, LED, v0.3.0. https://unfinished.one/c/lighting-led-interior/v/0.3.0"}