Technical Memorandum: Photometric and Electrical Measurements of Tunable-White Solid-State Lighting Products
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ANSI/IES TM-38-21(R26)
Document Type: Technical Memorandum (TM)
Available as a downloadable secure PDF only.
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Product Description
Intended Audience: Lighting manufacturers; testing laboratories; accreditation bodies; lighting designers and specifiers; utility incentive programs; program specifiers or regulators – examples include the ENERGY STAR program, Design Lights Consortium, LED Lighting Facts, California Energy Commission, and other Consortium Programs that may opt to use this document.
Intended Interest Categories: Specifier (US), Affected (UA), Public Interest (UP), Academic, Research (GAR), Government, Regulatory (GGR), General SME (GSME), Organizational (OM), Testing Equipment Users (TEU), Testing Equipment Manufacturers (TEM).
Description: Protocol for measuring photometric, colorimetric, and electrical characteristics of tunable-white solid-state lighting products – including lamps, luminaires, and light engines – as covered by ANSI/IES LM-79-19. This protocol applies to products for which the spectral power distribution can be adjusted with a single one-dimensional input having a quantitative, interval format, either continuous or discrete, that is nominally independent of flux control.
Page count: 19 pages
Publisher: Illuminating Engineering Society (2026)
SKU: ANSI/IES TM-38-21(R26)
ISBN-13: 978-0-87995-515-1
Previous edition: TM-38-21
Chapters:
- 1.0 Introduction and Scope
- 2.0 Normative References
- 3.0 Definitions
- 4.0 Preparation and Measurement
- 5.0 Data Interpolation
- 6.0 Test Report
- Annex A – Interpolation Implications
- Annex B – Example Report
Citation Format:
Illuminating Engineering Society. ANSI/IES TM-38-21(R26), Technical Memorandum: Photometric and Electrical Measurements of Tunable-White Solid-State Lighting Products. New York: IES; 2026.