IES

The IESNA LM-63 photometric data file is an ASCII text file commonly used by North American lighting fixture manufacturers to distribute photometric information about their products.

File Identification
IES files are ascii text. Files begin with IESNA:LM-63-(year). Examples LM-63-1986, LM-63-1991, and LM-63-1995, and LM-63-2002

Except the earliest version which uses the ascii: IESNA91

Links

 * Illuminating_Engineering_Society_of_North_America
 * ANSI/IES LM-63-02/R08
 * Parsing The IESNA LM-63 Photometric Data File
 * ERCO data files
 * LightLouver Information sheet