DIN EN 4731 Aerospace series – Spectral quality of LED luminaires used with photoluminescent marking systems

Introduction

Photoluminescent marking systems are commonly used in passenger airplanes to provide visual guidance in emergency events. Those marking systems need to be charged by ambient light during
cabin preparation and/ or aircraft operation as to be operational if, at any phase of a flight, an emergency occurs.
While the certification regulations require photoluminescent marking system to be sufficiently charged solely by cabin interior lighting, i.e. without accounting for daylight entering the cabin through windows, only certain portions of the visual light spectrum emitted by a cabin interior luminaire are stored by the photoluminescent pigment and thus contribute to charging

Scope

This document defines a measure for the spectral quality of LED luminaires in terms of the ratio of the amount of visual light emitted by the luminaire versus the amount effective for charging photoluminescent products contained in that spectrum.

Fulfilment of this document by a LED luminaire will ensure general compatibility of the luminaire with photoluminescent marking systems.

This document alone does not provide any means of compliance to fulfil any airworthiness requirements.

For a specific aircraft installation, the spectral power distribution and illuminance at the photoluminescent marking systems are relevant.

Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments)applies.

EN 4706, Aerospace series – LED colour and brightness ranking

CIE 018.2: 1983, The basis of physical photometry

LISUN following instruments fully meet DIN EN 4731 Aerospace series – Spectral quality of LED luminaires used with photoluminescent marking systems

LMS-6000 Portable CCD Spectroradiometer