Regulation 15 Lighting
All parts of the crew accommodation, except drying rooms, lockers and store rooms, shall where practicable be adequately lit by natural light.
An electric lighting system shall be installed which is capable of supplying adequate light in all parts of the crew accommodation. Electric lights shall be so arranged as to give maximum benefit to the crew and shall include an electric reading lamp for each bed, fitted with a controlling switch at the head of each bed, and a blue light in each sleeping room.
An efficient alternative lighting system or an alternative supply of electrical power to the system mentioned in paragraph (2) shall be available for emergency use in the crew accommodation.
For the purposes of this regulation, “adequate light” means in the case of:
natural lighting in sleeping rooms, hospitals and mess rooms, and
electric lighting in all rooms and other spaces in the crew accommodation,
light which is bright enough (in the case of (a) above, in day time in clear weather) to enable a person with normal sight to read an ordinary newspaper in those parts of the room or other space which are available for free movement; and “adequately lit” shall be construed accordingly.