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Minutes of the meeting
1. Opening of the meetingLiisa Halonen opened the meeting and welcomed all to the 4 th meeting of TC1-58. 2. Noting the TC members and introducing the participantsA list of the current TC members was reviewed. The participants introduced themselves. 3. Approval of the AgendaThe Agenda was approved. 4. TC Working programmeLiisa Halonen reminded of the TC terms of reference, these are: ‘ To define mesopic visual performance and related terms. To investigate performance based photometry in the luminance region below approximately 10 cd/m 2 . To propose a model for the basis of performance based mesopic photometry.' Liisa Halonen reviewed the outcomes of the previous TC1-58 meetings. In the 1 st meeting (Tokyo June 10, 2004) the new terms of reference were agreed. In the 2 nd meeting (León May 17, 2005) the TC working programme (tasks and schedule) was defined. In the 3 rd (Ottawa May 18, 2006) the TC work (outcomes of two Expert Surveys, model comparisons) was introduced and decision was made on generation of further data for model comparisons and analysis. The aim of the Beijing meeting is to present the analysis of MOVE- and X-models based on three new independent data-sets, to present draft of the contents of the TC report and to agree on the report contents, and to discuss the required future actions needed to accomplish the TC work. After the Beijing meeting the first draft of the TC report will be sent to members for their comments. The next meeting (5 th meeting) is planned to be in November 2007. The aim of the 5 th meeting will be to present and discuss the draft of the TC report and to present a proposal of a model for the basis of performance based mesopic photometry. After the 5 th meeting the TC report will again be circulated to members for their comments. The 6 th and final meeting of the TC will be held in June 2008 along the Div 1 meeting (possibly in Stockholm Sweden ). The aim of the final meeting is to agree on the TC report. The chairman presented the TC working programme which is divided into three main tasks according to the terms of reference. In the working programme analysis of new data and modeling of mesopic data are still in progress. After these are completed the TC can propose a model for the basis of performance based mesopic photometry. The aim is to finalise the TC work within four years from its start, this is by June 2008. 5. Presentation of recent mesopic research workThree presentations were given of recent research work done in the mesopic field.
6. Contents of the TC reportLiisa Halonen presented a draft of the TC report contents (Attachment 4). The contents are organized to follow the three sentences of the terms of reference. Marjukka Eloholma viewed the different chapters of the proposed report contents. Chapter 1 will be the Introduction. Chapter 2 describes mesopic visual performance and mesopic conditions and will be based on the two expert surveys carried within the TC work. The first draft of Chapter 2 will be sent to TC members by the end of September 2007. Chapter 3 will introduce the existing visual performance based mesopic models and this will be based on the existing literature on the models. The first draft of this chapter will be sent to members by the end of September 2007. Chapter 4 will present the test data used for testing the models and the testing procedures used. The first draft of this chapter will be sent to members by the end of October 2007. Chapter 5 will present the testing of the proposed models. This will be based on the testing done/to be done at HUT (testing underway for the Y-model). The first draft of Chapter 5 will be sent to members by the end of October 2007. Chapter 6 will be summary and conclusions and will be based on the results of Chapter 5. This will be discussed in the November meeting. 7. Agreement on the contents of the TC reportThe TC report contents were discussed. It was suggested that the order of the Chapters are changed so that the outcome of TC work (proposed model) will first be introduced, and this will be followed by the other chapters. This was agreed. The agreed modified contents of the TC report are attached (Attachment 4). Possible further comments on the report contents shall be sent to Liisa Halonen by August 7, 2007. 8. Next meetingThe chairman proposed that the next TC meeting (5 th meeting) will be held in Eindhoven Netherlands on November 9, 2007 along the ‘Light, Performance and Quality of Life' Symposium organized by SOLG (Nov 8, 2007). Other suggestions for possible meeting places were welcomed, so that the meeting will be held around November 2007. (Suggestions to be sent to Liisa Halonen by August 15, 2007, after which the date and place will be fixed). 9. Closure of the meetingThe chairman closed the meeting at 10:30 a.m. and thanked everyone for a successful meeting.
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