EN 410-1:2026

Glass in building - Determination of luminous and solar characteristics of glazing - Part 1: Calculation for non-light-scattering materials EN 410-1:2026

Publication date:   Jun 4, 2026

Scope

This document specifies methods of determining the luminous and solar characteristics of glazing in buildings. These characteristics can serve as a basis for lighting, heating and cooling calculations of rooms and permit comparison between different types of glazing.
This document applies both to conventional glazing and to absorbing or reflecting solar-control glazing, used as vertical or horizontal glazed apertures. The appropriate formulae for single, double and triple glazing are given. A matrix method is provided as an alternative calculation method.
This document introduces a method to determine the luminous and solar properties of Building-Integrated Photovoltaic (BIPV) glazing.
This document is applicable to all transparent materials except those which show significant transmission in the wavelength region from 5 µm to 50 µm of ambient temperature radiation, such as certain plastic materials.
Materials with light-scattering properties are not covered by this document.
NOTE CEN/TC 129 is preparing standards on measurement and calculation of luminous and spectral properties of materials with light-scattering properties. Until this is available, the methodology in this document can continue to be applied to materials with light-scattering properties.
Angular light and solar properties of glass in building are excluded from this document. Research work in this area is summarized in Bibliographic references [1], [2] and [3].
Guidance on the measurement of luminous and spectral properties of glass can be found in the Bibliography [4].
The background to Annex E on BIPV glazing can be found in the Bibliography [11].
Vacuum Insulating Glass (VIG) is excluded from the scope of this document. For determination of the g value of VIG, please refer to ISO 19916-1 [13].

Related legislation

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