This Technical Report is accompanying the lighting standard EN 15193-1:2017 and gives information to support the correct understanding, use and national implementation of this lighting standard.This document provides:— commentary to clauses of the standard;— explanation on the procedures and gives background information;— justification of the choices that have been made;— description of the processes;— spreadsheet of the calculation process;— worked examples and benchmark values;— advice on lighting control systems; and— guidance on the lighting design for domestic buildings.This document discusses but does not formally detail the lighting design process.