Building Services Engineering 5th Edition Handbook

11 Lighting
Learning objectives
Study of this chapter will enable the reader to:
1. explain the use of day and artificial lighting;
2. use lux and lumen per square metre;
3. state normal lighting levels;
4. explain general and task illumination;
5. understand permanent supplementary artificial lighting of interiors (PSALI);
6. understand artificial lighting terminology;
7. assess the importance of the maintenance of lighting installations;
8. calculate the room index;
9. find utilization factors;
10. discuss the problem of glare;
11. calculate the number of lamps needed to achieve a design illumination level;
12. calculate lamp spacing for overall design;
13. calculate the electrical loading produced by the lighting system;
14. consider how luminaires should be oriented in relation to room layout and visual tasks
to be performed;
15. understand the use of air-handling luminaires;
16. understand lamp colour-rendering and colour temperature;
17. know the range of available lamp types;
18. apply appropriate lamp types to designs;
19. understand the working principles of lamp types and their starting procedures.
Key terms and concepts
artificial and natural illumination 261; BZ classification 264; colour-rendering 269; colourrendering
index 269; colour temperature 269; daylight factor 262; efficacy 264; electrical
power consumption 268; glare 267; heat generation 262; illuminance 261; lamp types 269;
LDL 262; lighting cost 272; light loss factor 265; lumen 265; luminaire 269; luminance