Click here for the Media Kit
Lighting : April 2010 Whos Who of Lighting
50 LIGHTING MAGAZINE | April/May 2010 meantime the development of methods to assess UV-A protection continued and is still on-going, especially on in vitro methods. Furthermore, the computer-aided calculation of sunscreen performance – referred to as in silico – became more sophisticated and useful. Rather than trying to find a consensus on sunscreen testing the objective of the reactivated TC 6-24 has now been reduced to giving, in the form of a Technical Report, a comprehensive overview as well as an assessment and ranking of the UV-A methods currently under discussion. This report starts with the general principles of UV protection and an overview of UV-A and broad-spectrum UV filters. Then a description and assessment of in vivo, ex vivo, in vitro and in silico methods is given. SELECTED PAPERS of the Light and Lighting Conference with Special Emphasis on LEDs and Solid State Lighting CIE x034:2010 | ISBN 978 3 901906 79 4 In May 2009 the Light and Lighting Conference took place in conjunction with the CIE Midterm Meeting. The conference dealt with all aspects of light and lighting, with special emphasis on LEDs and Solid State Lighting, covering vision and health as well as the measurement of these modern devices and their application. From the large number of oral and poster presentations in the scientific program of the conference 24 papers were selected by CIE experts for this CIE publication. These selected papers cover the whole range of the conference topics, i.e. latest achievements obtained in light and lighting, their consequences in photometry and colorimetry, their health aspects, and applications, both indoor and outdoor. The publication consists of 186 pages with 150 figures and 64 tables. CIE x034:2010 is readily available on CD-ROM at the CIE National Committees. Colorimetry – Part 5: CIE 1976 L*u*v* Colour Space and u’,v’ Uniform Chromaticity Scale Diagram ISO 11664-5:2009(E) | CIE S 014-5/E:2009 This joint ISO/CIE Standard (replacing CIE S 014-5/E:2009) specifies the method of calculating the coordinates of the CIE 1976 L*u*v* colour space including correlates of lightness, chroma, saturation and hue. It includes two methods for calculating Euclidean distances in this space to represent the relative perceived magnitude of colour differences. It also specifies the method of calculating the coordinates of the u’,v’ uniform chromaticity scale diagram. The Standard is applicable to tristimulus values calculated using the colourmatching functions of the CIE 1931 standard colorimetric system or the CIE 1964 standard colorimetric system. The Standard may be used for the specification ofcolour stimuli perceived as belonging to a reflecting or transmitting object, where a three-dimensional space more uniform than tristimulus space is required. This includes self-luminous displays, like cathode ray tubes, if they are being used to simulate reflecting or transmitting objects and if the stimuli are appropriately normalised. The Standard, as a whole, does not apply to colour stimuli perceived as belonging to an area that appears to be emitting light as a primary light source, or that appears to be specularly reflecting such light. Only the u’,v’ chromaticity diagram defined in Section 4.1 and the correlates of hue and saturation defined in Section 4.3 apply to such colour stimuli. This Standard has been approved by CIE and by ISO. It may be obtained from the CIE National Committees or via the website of the CIE Central Bureau (www.cie.co.at). Reappraisal of Colour Matching and Grassmann’s Laws CIE 185:2009 | ISBN 978 3 901906 78 7 The laws of additivity and proportionality of colour matches, Grassmann’s laws, are the basis of all colour theory, but are not axiomatically true. The extent of departure of human vision from Grassmann’s laws has been periodically examined. One exploration, by W. A. Thornton, found considerable failure of transformability of primaries – a symptom of Grassmann additivity failure. In the 14 years since Thornton’s finding, several groups have formed to replicate and understand Thornton’s results and the limitations of Grassmann’s laws. CIE TC 1-56 is the latest of these. During the ten years of this committee’s existence, statistical simulations indicated that replicate matches by the same observer (not present in Thornton’s data) are required to suppress random errors, and accordingly three laboratories generated intra-observer matching results in three different luminance domains. Two of the studies, respectively conducted at 300 cd•m-2 and 30 cd•m-2, confirm Grassmann additivity, but the third study shows failure of additivity at 3 cd•m-2. In addition, Maxwell and maximum-saturation colour matches have long been known to be inconsistent even at high luminance levels and with intra-observer match replication to suppress noise. A practical consequence of the failure of additivity could be problems observed in cross-media colour matching, although cross-media studies also have other well known sources of imprecision when the colour-matching is asymmetric. Some suggestions are made for a covering theory of Grassmann’s laws that might accommodate both Maxwell and maximum-saturation match data while still maintaining consistency with high-luminance success in experiments such as reported recently. Further investigations are indicated for a successor to TC 1-56. The publication is written in English, with a short summary in French and German. It consists of 20 pages with 3 figures, and is readily available at the National Committees of the CIE or via the website of the Central Bureau of the CIE (www.cie.co.at). L SOCIETIES IeS MeMbeR TIPS why am I not receiving electronic newsletters (assuming current membership)? Check your email address on the database and update as required. Go to: https://www.iesanz.org/content/login Forgotten your password? Select the prompt and you will be sent a new password. It’s that easy! It’s your newsletter.
Whos Who of Lighting 2009
April May 2011