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This 2026 edition sets out the requirements for thermoplastic lighting diffusers in buildings. It explains how fire safety guidance is addressed across Approved Documents and Building Regulations in England, Wales, Northern Ireland and Building Standards Scotland. It also outlines what this means for the specification and use of luminaires in practice.
This is a full rewrite of the 2018 edition and reflects current regulatory guidance. Author: Richard Caple MSc FSLL (Thorlux Lighting).
This is one of the Society of Light and Lighting's series of freely available factfiles, all of which are available here: