IES viewer 299n

IES stands for Illuminating Engineering Society. IES
standard file format was created for the electronic transfer of
photometric data over the web. It has been widely used by many lighting
manufacturers and is one of the industry standards in photometric data
distribution. An IES file is basically the measurement of distribution
of light (intensity) stored in ASCII format. You can think of it as a
digital profile of a real world light. In 3d software like 3ds max it
can be used for creating lights with shapes and physically accurate
form.