IES files are used for storing photometric data about light fixtures.

IES files are used for storing photometric data about light fixtures. The acronym "IES" stands for Illuminating Engineering Society, which is an organization that sets standards for lighting. These files provide detailed information about how light is distributed from a fixture, including intensity, distribution patterns, and other characteristics.

Key Points about IES Files:

Purpose: They are used in lighting design and analysis to simulate how light will behave in a given space.

Format: IES files are typically in plain text format with a specific structure defined by the IES standards. They contain data such as light intensity values at different angles.

Usage: These files can be imported into various lighting design software programs (e.g., DIALux, AGi32) to help with visualizing and calculating lighting performance in a virtual environment.

Content: An IES file includes information such as the type of light distribution (e.g., wide, narrow), the photometric data (e.g., candela values), and the geometry of the light source.