IEC TR 62778-2014 PDF

Full title and description

IEC TR 62778:2014 — Application of IEC 62471 for the assessment of blue light hazard to light sources and luminaires. This technical report provides clarification and practical guidance for applying the photobiological safety limits and classification scheme of IEC 62471 specifically to light sources and complete luminaires whose main emission lies in the visible spectrum (380 nm to 780 nm). It explains how component-level measurements (LED packages, modules, lamps) can be interpreted and transferred to higher-level products (luminaires) and includes additional material addressing LED arrays and summary recommendations for consistent application.

Abstract

IEC TR 62778:2014 complements IEC 62471 by focusing on the assessment of the retinal blue-light hazard for white and visible-spectrum lighting products. The report introduces calculation methods, threshold concepts (e.g., blue-light weighted radiance and threshold illuminance), measurement guidance for large and small source regimes, and recommendations for documenting component-to-luminaire transfer information (including a threshold illuminance or threshold distance). Annex D of the 2014 edition adds specific guidance for LED arrays.

General information

• Status: Withdrawn (withdrawal announced in 2023).
• Publication date: 27 June 2014 (Edition 2.0).
• Publisher: International Electrotechnical Commission (IEC), TC 34 Lighting.
• ICS / categories: 29.140.01 (lighting).
• Edition / version: 2.0 (this edition cancels and replaces the 2012 first edition).
• Number of pages: 37 pages (technical report).

Scope

Provides practical guidance for assessing the blue‑light retinal hazard for lighting products with main emission in the visible range (380–780 nm). The report clarifies how to interpret IEC 62471 measurements for components and how to propagate that information to luminaires, defines measurement regimes for large and small sources, supplies calculation examples and conversion factors, and offers recommendations for labelling/communication of threshold illuminance or threshold distance for end products. The 2014 edition extends the guidance to cover LED arrays.

Key topics and requirements

• Interpretation and application of IEC 62471 limits specifically for blue-light retinal hazard (BLH) in visible-spectrum lighting products.
• Definitions and measurement guidance for large-source and small-source regimes (field of view considerations, measurement geometry, recommended measurement distance and FOV).
• Introduction and use of blue-light weighting and metrics (e.g., blue-light weighted radiance L_B and K_B,V conversions used to relate radiance to luminous output).
• How to transfer component-level photobiological data (LED packages, modules, lamps) to luminaires and final products, including reporting of threshold illuminance or threshold distance.
• Specific guidance on LED arrays (added Annex D in the 2014 edition) and worked examples to assist consistent classification.
• Recommendations for test report format (an associated IECEE test report form was later published to support IEC TR 62778).

Typical use and users

Used by luminaire and LED component manufacturers, product safety and compliance engineers, testing and certification laboratories, standards committees, and regulators to assess or demonstrate compliance with photobiological safety requirements (blue-light hazard) and to provide component data that can be relied upon when integrating light sources into finished luminaires. Also referenced by standards writers when embedding photobiological requirements into product safety standards.

Related standards

Directly related to and intended to be used with IEC 62471 (Photobiological safety of lamps and lamp systems). Also referenced by product safety standards such as IEC 60598-1 (luminaires), IEC 62031 (LED modules), IEC 62035 (discharge lamps), and by CIE guidance (CIE S 009). An IECEE Test Report Form (TRF 62778A) supports reporting against this TR.

Keywords

IEC TR 62778, blue light hazard, photobiological safety, IEC 62471, LED arrays, luminaires, spectral radiance, K_B,V, threshold illuminance, risk group, photobiological classification.

FAQ

Q: What is this standard?

A: IEC TR 62778:2014 is a technical report that gives guidance on applying the photobiological safety limits of IEC 62471 specifically to visible-light sources and luminaires, with methods and examples for assessing blue-light retinal hazard.

Q: What does it cover?

A: It covers measurement geometry and regimes for large and small sources, blue-light weighted radiance calculations, transfer of component test data to luminaires (including threshold illuminance/distance concepts), worked examples, and specific guidance for LED arrays (Annex D in the 2014 edition).

Q: Who typically uses it?

A: Manufacturers of LEDs and luminaires, compliance/test laboratories, safety engineers, standards developers and regulators who need consistent methods to determine photobiological risk groups for products and to document safe use conditions.

Q: Is it current or superseded?

A: IEC TR 62778:2014 (Edition 2.0) has been withdrawn (withdrawal recorded in 2023). Users should check for any replacement documents or updated guidance from IEC or relevant national bodies when performing current compliance work.

Q: Is it part of a series?

A: Yes — it is a Technical Report intended to be used alongside IEC 62471 and other IEC lighting safety/product standards; it also has an associated IECEE test report form (TRF 62778A) to standardize reporting.

Q: What are the key keywords?

A: Blue-light hazard (BLH), photobiological safety, IEC 62471, LED arrays, radiance, K_B,V, threshold illuminance, luminaire assessment, risk group (RG).