CPD PROGRAMME | LIGHTING products; and aspects that will impact the sustainability of the lighting system. The chapter Coordination with other services is included to help guide the many people coming into the lighting profession from non-engineering backgrounds such as theatre design, fashion styling or architecture who may not be familiar with the demands of mechanical and electrical services and the challenges in using the shared space. This includes providing access and integration with other ceiling services, distribution of power cabling, and the interaction of cooling systems and the impact on the performance of lights. Part 2 Technology has been updated extensively and includes two new chapters Light sources and Power to lighting systems as well as incorporating significant changes to the Controls chapter. Light sources provides thorough coverage of the whole range of lighting technology that, as may be expected, includes a significant segment on LEDs, their construction, directionality and the type of light emitted. The operational efficacy of LEDs is discussed, and this notably includes temperature sensitivity as most traditional light source LEDs struggle to dissipate heat, and increasing the temperature at the LED can seriously reduce its light output, it emphasises the importance of the lighting design to maximise heat dissipation from the LED chip. The extensive section on LEDs does not displace coverage of the more traditional lamp types, such as metal halides and discharge lamps, which are included complete with considerations of the peculiarities of each type even extending to a short section on gas lighting. The significant changes in the Controls section were driven by the needs of lighters to understand the rapidly advancing area of electronic and digital controls. The energy consumption of a lighting installation can be significantly reduced by the addition of automatic lighting controls. The handbook notes that they are essential for design compliance with current Building Regulations and/or energy performance requirements, although lighting performance should not be compromised in the sole interests of energy conservation. In his presentation, Ruffles reflects that many of the problems with the application of LEDs has been to do with the electronics rather than the LEDs themselves. The Lighting Energy Numeric Indicator (LENI) is introduced as a reasonable starting point in lighting energy prediction, but notably the actual energy savings will be governed by the specific application and human factors. The inclusion of a new Power to lighting systems chapter reflects the importance Figure 1: The light reflectance values as reported on a paint swatch. The light reflectance value ranges from 0 to 100, with 0 representing pure black (that is, not light-reflecting at all) to 100.0, pure white, with all the light being reflected (Source: SLL Lighting Handbook) of the rapidly evolving topic. Although it is not an electrical engineering chapter, it outlines the circuit design process, and how cables are installed and run through the building so that lighters are aware that designs must account for the realities of supplying power and routing cables. There is a salient reminder early in the chapter that, no matter how complex a design is, there are two basic requirements associated with the distribution and use of electricity the safety of people and ensuring that the risk of fire is not introduced. It goes on to describe final circuit distribution protection and effective cable length, something that is both important for emergency lighting and for DC-based systems such as LED lighting. It discusses conventional and modular cabling systems, and the chapter closes with information on distributed power systems, with an overview of DC-based systems including brief information on power over ethernet (PoE) that is based on the available information at the time of writing the chapter. Part 3 of the handbook, Applications, makes up the bulk of the publication and is broken into 22 chapters, as shown in Table 2. This includes a whole range of areas many that are also covered in more detail in the separate SLL Lighting Guides and four new chapters to provide a lighting design resource that is likely to encompass most normal building requirements. The new Common building areas chapter includes the generic areas that are found in almost all types of buildings, such as entrance halls, corridors, lift lobbies, toilets, cleaners rooms and plant rooms. The guidance attempts to give practical information that has previously been absent in standards and guides. So, for example, toilets were previously simply designated as requiring 100 lux, with no specific guidance where this should be measured. This chapter provides recommended lighting levels for the floor, basins and surrounding surfaces, at toilet seat level and over baby changing tables. Similarly, for example, there is increased granularity in the guidance for connecting spaces such as ramps, where it notes that for design purposes, they should be treated in the same way as corridors. However, with an inclined floor and possibly flat areas, it notes that where ramps form part of an exit route, emergency lighting should be provided with additional emphasis on the start and stop of the incline. Another example where the handbook drills down to essential, and practical, guidance is when describing the lighting needs for cleaners APPLICATIONS Common building areas (new in 2018) Retail lighting Industrial premises Educational premises Retail premises Museums and art galleries Hospitals and healthcare buildings Places of worship Communal residential buildings Places of entertainment Courts and custodial buildings (new in 2018) Transport buildings Extreme environments (new in 2018) Exterior workplaces Exterior architectural lighting (new in 2018) Roads and urban spaces Security lighting Sports Historic buildings and spaces (new in 2018) Commissioning of lighting installations (new in 2018) Performance verification Maintenance Table 1: The majority of the handbook provides a set of applications chapters that cover most normal lighting applications 20 December 2019 www.cibsejournal.com CIBSE Dec19 pp19-22 CPD Supp.indd 20 22/11/2019 17:06