DIN 67524-2 2025-06 PDF

Full title and description

STB DIN 67524-2:2025-06 — Lighting of road tunnels and underpasses - Part 2: Calculation and measurement. This part specifies the calculation methods and measurement procedures for evaluating tunnel and underpass lighting (luminance, measurement geometry, instrumentation and reporting), intended to be read together with Part 1 (quality criteria and guidance).

Abstract

This document defines standardized methods to calculate required lighting levels and to perform objective measurements in road tunnels and underpasses, including guidance on measurement positions, fields of view, instrument requirements and how to determine access-zone luminance and related performance indicators. It updates and replaces earlier editions of Part 2 to reflect current measurement practice.

General information

• Status: Current / active.
• Publication date: June 2025 (2025-06).
• Publisher: Deutsches Institut für Normung (DIN) / German Institute for Standardisation.
• ICS / categories: 93.080.40 (Lighting of roads and tunnels / lighting engineering).
• Edition / version: 2025-06 (current edition).
• Number of pages: 21 pages.

Key bibliographic and status details as published by DIN and distribution partners.

Scope

Specifies calculation procedures and measurement methods for the lighting of road tunnels and underpasses. Topics include determination of access-zone luminance (L20), measurement geometry and viewing fields, instrument and calibration requirements, procedures for in-situ measurements and how to report results and deviations from target values. The part is intended to be used alongside the Part 1 document that sets quality criteria and threshold values.

Key topics and requirements

• Definitions and reference quantities for tunnel lighting (e.g., L20 and other luminance metrics).
• Calculation methods for design luminances and transition zones.
• Field measurement procedures: measurement positions, heights, and required fields of view.
• Instrumentation and accuracy: required photometers/imaging luminance meters, calibration, and spectral response considerations.
• Measurement tolerances, averaging methods and handling of transient influences (e.g., sun, weather, traffic).
• Reporting format and acceptance criteria for commissioning and periodic verification.

These topics reflect the document’s focus on harmonized, repeatable measurement and calculation practice for tunnel lighting.

Typical use and users

Primary users are tunnel lighting designers and consultants, road and tunnel authorities, commissioning and inspection bodies, accredited measurement laboratories and manufacturers of lighting and luminance-measurement equipment. The standard is used for design verification, commissioning tests, periodic inspections and to document compliance with national/regional safety and lighting requirements.

Related standards

This Part 2 complements DIN 67524-1 (general quality criteria and guidance for tunnel lighting). It is commonly used alongside other lighting and road standards such as the DIN/DIN EN series for road lighting and workplace lighting (for example DIN 5035 and relevant EN road-lighting documents), and with national/regional tunnel guidance and CIE publications on luminance measurement.

Keywords

tunnel lighting, underpass lighting, luminance measurement, L20, measurement geometry, luminance meter, lighting calculation, commissioning, DIN 67524, tunnel safety.

FAQ

Q: What is this standard?

A: DIN 67524-2:2025-06 is the part of the DIN series that specifies calculation and measurement methods for lighting in road tunnels and underpasses; it provides the practical measurement procedures and criteria to verify lighting performance.

Q: What does it cover?

A: It covers how to calculate required luminances, how to perform in-situ luminance and related measurements (including instrument and field-of-view requirements), measurement positions and reporting formats, and how to evaluate results against specified criteria.

Q: Who typically uses it?

A: Lighting designers, tunnel operators and road authorities, accredited measurement labs, consultants and equipment manufacturers use this standard for design verification, commissioning and periodic inspection.

Q: Is it current or superseded?

A: Current — the 2025-06 edition is published as the active edition and replaces the earlier DIN 67524-2:2011-06 edition.

Q: Is it part of a series?

A: Yes — it is Part 2 of the DIN 67524 series (Part 1 covers general quality characteristics and guidance). It is intended to be used together with Part 1 and with other road- and lighting-related standards for complete specification and compliance.

Q: What are the key keywords?

A: Tunnel lighting, luminance, L20, measurement method, luminance meter, calculation, commissioning, DIN 67524.