There should be sufficient natural light during daylight hours to habitable rooms to enable normal domestic tasks to be carried out without eyestrain.
Windows should be of adequate size, shape and position to allow daylight to penetrate into rooms. The minimum level of natural light can be achieved by providing windows of 1/10th of the room floor area.
Artificial light should be sufficient to enable domestic and recreational activities to be carried out without eyestrain.
Adequate artificial lighting should be provided to common parts such as hallways and staircases. This should be adequately sited and provide sufficient level of control. Time switches in common parts are generally acceptable provided there are adequate time intervals to allow occupants to pass safely between illuminated areas.