Minutes of the meeting

1. Opening of the meeting

Liisa Halonen opened the meeting.

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2. Noting the TC members and introducing the participants

A list of the current TC members was viewed, the current members are: Halonen FIN, Eloholma FIN, McFadden CAN, Simpson CAN, Viénot FR, Schanda HU, Bodrogi HU, da Pos IT, Sagawa JP, Itoh JP, Ayama JP, ChangSoon KO, Derefeldt SE, Pointer UK, Fotios UK, Yandek US, Leetzow US, Lewin US, Grawford US. A list was passed around, where the attendants were asked to mark whether they are or want to become members or whether they are observers in the meeting (Attachment 1: Updated list of TC1-58 members).

The participants shortly introduced themselves.

3. Apologies for absence

Apologies for absence had been received from: William Simpson CAN, Miyoshi Ayama JP, Ian Lewin US, Pieter Walraven NL, Teresa Goodman UK and Steve Fotios UK.

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4. Approval of the Agenda

The Agenda was approved.

5. Presentation of recent mesopic research work

Two presentations were given of recent research work done in the mesopic field.

Marjukka Eloholma presented a new performance based mesopic model, which has been developed by a European research consortium MOVE (slides in Attachment 2). The MOVE report is available at www.lightinglab.fi/CIETC1-58/move.

Stephan Völker gave a presentation on "Problems at night-time traffic and steps of solutions" (slides in Attachment 3).

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6. TC Working programme

The chairman informed that the aim of this meeting are to decide the tasks of the TC work, to decide who does what and to decide on the working schedule.

The terms of reference of the TC are:

"To define mesopic visual performance and related terms. To investigate performance based photometry in the luminance region below approximately 10 cd/m². To propose a model for the basis of performance based mesopic photometry."

The first subtask Define mesopic visual performance and related terms was further divided into working tasks:

• Define most relevant mesopic applications
• Define most critical visual tasks in each application
• Define related terms (parameters for defining visual performance for each visual task)
• Definition of mesopic visual performance

There was an active discussion on the definition of the relevant mesopic applications. It was decided that the TC will concentrate on the following mesopic applications: road lighting, street lighting, railway lighting, navigation, aviation, (and cinema). For each of these applications the actions to be taken are: to give criteria for this application being mesopic, definition of most critical visual tasks in this application and definition of relevant lighting and task parameters.

The following responsible workers and co-workers for each application were named:

It was decided that these tasks should be completed by the end of 2005.

The second subtask Investigate performance based photometry in the luminance region below approximately 10 cd/m² was further divided into working tasks:

• Collect the existing mesopic data
• Analyse the existing mesopic data
• Exchange knowledge and give input to ongoing works
• Generate new data for performance based mesopic models
• Analyse the new data
• Model the mesopic data

The collection of existing mesopic data will be carried out through TC1-58 surveys (questionnaires). It was decided that in generating new data L-Lab (Völker) will be the responsible worker and the co-workers are HUT (Halonen), UV (Bodrogi), Leeds ? (Luo), SMPTN ?, Kodak, Charles Harrison, Japanese group (Sagawa), Charles Bradford. The generation of new data shall be completed by the end of 2007.

To fulfill the third subtask Propose a model for the basis of performance based mesopic photometry the TC shall come to this recommendation by June 2008.

7. Closure of the meeting

Liisa Halonen closed the meeting and thanked all the participants for a very good and fruitful meeting.

• Attachment 1: Updated list of TC1-58 members
• Attachment 2: Presentation by Marjukka Eloholma
• Attachment 3: Presentation by Stephan Völker