COMMISSION INTERNATIONALE DE L'ECLAIRAGE INTERNATIONAL COMMISSION ON ILLUMINATION INTERNATIONALE BELEUCHTUNGSKOMMISSION

 

Joint Workshop on Photometry of Flashing Lights

Warsaw, Poland

Friday, June 25, 1999 

As decided at the Boulder meeting, there will be a Joint Workshop on Photometry of Flashing Lights by Division 2 and Division 1 in Warsaw. It is scheduled for 14:30 to 17:00 on Friday, June 25, 1999, and being organized by Yoshi Ohno and Dr. Sagawa (D1 Director).

This workshop was motivated by the report from R2-17 Aviation Photometry, which noted recent activities in the U.S. to develop the measurement procedures for aircraft anticollision lights (SAE ARP 5029) and the flashing light photometric standards, which were needed for enforcement of the regulation on aircraft anticollision light maintenance. In this work, many questions were raised on physical measurement methods of flashing lights and also on the visual perception of flashing lights. The effective intensity (defined by the Blondel-Rey equation) is widely used for flashing light measurements, but is based on experiments done for central vision almost 90 years ago. It addresses the visual perception only under limited conditions. Flashing light is used in many other safety devices such as traffic barricade lights, which also require accurate intensity measurements. The issue of flashing lights is one of the long lasting problems in visual signaling and still has no perfect solution. This workshop will investigate the problem from the viewpoint of new developments and research in physical measurements and visual science, and will address future work for CIE.

We are calling for several papers from any experts in this area. Please relay this message to those who may be involved in flashing light research in your country. Anybody who wishes to present a paper in this Workshop, please contact Yoshi Ohno (e-mail: ohno@nist.gov, fax: +1 301 840 8551) by December 31, 1998.