Lighting : Lighting February 2015 - Vol 35 Issue 1
February/March 2015 | LIGHTING MAGAZINE 43 The book has 17 chapters arranged in three sections: fundamentals (basically technology, measurement and vision), generalities (light and work, visual comfort and the perception of spaces and objects) and specifics (lighting for various generic applications, light and health, light pollution and energy consumption). Chapter 17’s title is The Way Ahead and unlike the others which are based scientific and empirical experience, gives the author’s opinions on the problems facing lighting today and into the near future. Important sections are on the problems with new technology, new knowledge and increased pressure (for saving energy and money). He concludes with a discussion on research methods and the value of research. For the reader who wants for explore matters further there are 56 pages of references and a comprehensive index. In my review of the second edition I wrote “the book is superbly written, with flashes of Peter’s wry humour throughout this otherwise very serious book.” This is still evident. Another thing that is still true is my conclusion to that review is that: If you buy only one book on lighting in your life, it would have to be this. I thoroughly recommend it as not only a great investment but also an enjoyable read. – Warren Julian NeW Cie publiCatioNS TEST METHOD FOR LED LAMPS, LED LUMINAIRES AND LED MODULES CIE Draft International Standard DIS 025/E: 2014 This standard provides requirements to perform reproducible photometric and colorimetric measurements on LED lamps, LED modules, and LED luminaires (LED devices). It also provides advice for the reporting of the data. The availability of reliable and accurate photometric data for LED devices is a basic requirement for designing good lighting systems and evaluating performance of products. By obtaining these data through measurements in specific normalised measuring conditions, the consistency of the data should be ensured between different laboratories (within the limits of the declared measurement uncertainty) and comparison of different products on the same basis is possible. The standard specifies the requirements for measurement of electrical, photometric, and colorimetric quantities of LED lamps, LED modules and LED luminaires, for operation with AC or DC supply voltages, possibly with associated LED control gear. LED light engines are assimilated to LED modules and handled accordingly. Photometric and colorimetric quantities covered in this standard include total luminous flux, luminous efficacy, partial luminous flux, luminous intensity distribution, centre-beam intensity, luminance and luminance distribution, chromaticity coordinates, correlated colour temperature (CCT), colour rendering index (CRI), and angular colour uniformity. This standard does not cover LED packages and products based on OLEDs (organic LEDs). The standard aims in particular to cover measurement methods for testing the compliance of LED devices with the photometric and colorimetric requirements of LED performance standards issued by IEC TC 34 “Lamps and related equipment”. As LED devices offer a large variety of configurations in respect to geometry and/or colour, the photometric and colorimetric performances are considered individually for each configuration. The Draft International Standard has been sent to CIE National Committees for comments and sales to interested parties. It is still subject to changes and may not yet be referred to as a CIE International Standard. GUIDE TO PROTOCOLS FOR DESCRIBING LIGHTING CIE 213:2014 ISBN 978-3 -902842-52-7 Lighting quality encompasses human needs, architectural integration and economic constraints (including energy). To develop information about the luminous conditions that will fulfil lighting quality goals in various settings one needs to know how people respond, in the broadest sense, to electromagnetic radiation detected by the eye and processed by various physiological systems. Common definitions and measurement protocols for lighting installations are needed to support this work and to support communication with designers. This guide, the work of CIE Technical Committee 3-34, establishes a catalogue of application-independent descriptors of lighting and protocols associated with each descriptor. The committee developed a system of two categories of descriptors: basic descriptors, which ought to be reported in any project and which can generally be measured with relatively simple equipment, and specialised descriptors, which will not always be required and the measurement of which is more complex. This document is intended to aid the development of lighting quality concepts by providing a common basis for communication about the luminous conditions, existing or planned, in a space. By using the definitions provided here, and by following the protocols and the overall procedure, writers and readers alike can come to a deeper understanding of the physical conditions that stimulate human responses to light in the built environment.
Lighting December 2014 - Vol 34 Issue 6
Lighting April 2015 - Vol 35 Issue 2