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The latest Code is in fact the 20th edition and carries on the long tradition of providing authoritative advice on lighting. The new edition is significantly different to the edition in a number of ways.
First of all the format has changed — instead of the CD format of old the version has been produced as a book. The content of the Code is also significantly different and these changes were introduced for two reasons.
Firstly, the SLL Handbook, which was introduced in , carries a lot of material about lighting equipment and lighting design. Consequently, there was no point repeating that material in the Code. The recommendations in the new standard have changed in a number of ways: — Each task now has its own uniformity requirement; — There is now a requirement for a background illuminance in areas up to 3. A key point made more explicit in the new edition of the Code relating to requirements for indoor workplaces is that the lighting should be on the stated visual tasks.
The latest edition of the Code takes this one step further. In the section on indoor workplaces it advises that it is wasteful of energy to light the whole space when a particular task is carried out over a relatively small area.
Thus it provides, in a single book, the performance requirement for the vast majority of lighting applications. These sections are supported by all of the necessary background information so that all the parameters discussed can be evaluated from first principals. The topics covered include: — Basic energy and light; — Luminous flux, intensity, illuminance, luminance and their interrelationships; — Direct lighting;.
The SLL Lighting Handbook
SLL Lighting Publications