October 26th is the fourth day of IEC/TC76 (Optical Radiation Safety and Laser Equipment) Beijing meeting, four working groups as well as IEC TR 62471-4 meeting held their working meetings, and a dinner party was held in 1949 Restaurant.

WG5 (Safety of fiber optics communications systems working group) second meeting was held in Orchid room this morning, twelve experts from United Kingdom, United States of America, Japan, Republic of Korea and China attended the meeting. Because Mr. Michael Regan who is the co nvenor of WG5 could not speak out of the sound since starting from the middle of the first meeting, the meeting was organized by Mr. Kenneth Puckett who is United States delegation. The meeting co ntinued to discuss the revision of IEC 60825-1 /CDV / Ed2.0 docu ments.

WG9 (Non coherent sources working group) meeting was held in Wenhua room in the morning, the meeting discussed the following three standard projects: revised of IEC 62471-2 “Photobiological safety of lamps and lamp systems Part2: Guidance on manufacturing requirements relating to non-laser optical radiation safety”, discussed some issue of IEC 62471-4 “Photobiological safety of lamps and lamp systems Part 4: Measuring methods”, and revised NWIP a bout IEC 62471-6 “Photobiological safety of lamps and lamp systems Part 6: UV sources”. Some experts from Germany, China and Japan built a task group to resolve some issue of photobiological safety.

WG8 (Development and maintenance of basic standards working group) second meeting was held in the Wenhua Hall in the afternoon , the co nvenor was Mr. O’Hagan John, eighteen experts attended the meeting. Experts discussed ramework>, which was issued by Dr. Craig A. Williamson and Dr. Leon N.McLin. The presentation introduced the background of the laser eye dazzle, and gave a proposal on the safety f ramework. Regarding with the co nsumer laser safety topic, experts reviewed the , nsumer laser products > and n> issued by 6.2.2014, experts argued to the proposal whether it is feasible to produce an internatio nal standard or whether the work should be restricted to CENELEC. At the last, experts updat ed the labels including ISO signal words (for co nsistency with the classification labels).

WG4 (Safety of medical laser equipment working group) third meeting was held in the Orchid Room in the afternoon. Firstly, the meeting co ntinued to discuss some co ntents of IEC 60601-2-22 “particular requirements for basic safety and essential performance of surgical, cosmetic therapeutic and diagnostic laser equipment” draft, such as limits on output, medical software system, etc. After the introduction of the background of IEC 60825-8 TR “Safety of laser products–Part 8: Guidelines for the safe use of laser radiation on humans”, a discussion a bout future aspects of the combination of guidance TR3 and TR8 has been carried out. Then the TR8 working draft has been discussed and modified one by one.

IEC TR 62471-4 meeting was held in the Lily Room in the afternoon.The meeting was organized by Prof. Mou who is project leader. Several experts from USA, Germany, Japan and China attended the meeting. Prof. Mou introduced the docu ment f rame of IEC 62471-1 and IEC 62471-4, reviewed of comments for IEC TR62471-4 and discussed some im portant issues. The docu ment of IEC 62471-4 focuses on providing guidance on measurements for photobiological safety classification, and gives some examples wher e simplified methods or assessment techniques could be used.