If you could provide more context or clarify what "Meyd 671" refers to, I would be more than happy to assist in developing a more targeted and informative report.
The IES data format is an internationally accepted data format used for describing the light distribution of luminaires. It can be used in numerous lighting design, calculation and simulation programs. The data is provided as a complete archive; however, a specific selection according to the technical environment and individual product range is also possible.
You can use the search function to search for article numbers and find older articles in the product archive.