I design emergency lighting systems for all types of premises, working to BS5266-1:2016, BSEN1838:2013, BS7671:2018+A1:2020, and Approved Document B. As well as common self-contained emergency lighting I also provide designs for DALI, self-testing, intelligent, central battery, and inverter based emergency lighting and backup lighting systems. I believe that when designing emergency lighting it is essential to have a detailed understanding of the different technologies and how they operate, as well as of electrical regulations and conventions.