The local authority may require artificial lighting to be provided to augment natural lighting in any case where, in spite of compliance with the provisions of this Chapter, the natural lighting in a room is, in the opinion of the local authority, inadequate.2

2For the guidance of local authorities, a table of standard service illuminance recommended by the illuminating Engineering Society of London, Great Britain, is set out in the Schedule, and is not to be constructed as part of the provisions of this Chapter. The Schedule is not fully comprehensive of all requirements.