# EULUMDAT File Format Specification

Line |
Description |
Number of characters |
---|---|---|

1 |
Company identification/databank/version/format identification |
Max 78 |

2 |
Ityp - Type indicator (0 - point source with no symmetry; 1 - symmetry about the vertical axis; 2 - linear luminaire; 3 - point source with any other symmetry. Note: only linear luminaires, Ityp = 2, are being subdivided in longitudinal and transverse directions) |
1 |

3 |
lsym - Symmetry indicator (0 ... no symmetry; 1 - symmetry about the vertical axis; 2 - symmetry to plane C0-C180; 3 - symmetry to plane C90-C270; 4 - symmetry to plane C0-C180 and to plane C90-C270) |
1 |

4 |
Mc - Number of C-planes between 0 and 360 degrees (usually 24 for interior, 36 for road lighting luminaires) |
2 |

5 |
Dc - Distance between C-planes (Dc = 0 for non-equidistantly available C-planes) |
5 |

6 |
Ng - Number of luminous intensities in each C-plane (usually 19 or 37) |
2 |

7 |
Dg - Distance between luminous intensities per C-plane (Dg = 0 for non-equidistantly available luminous intensities in C-planes) |
5 |

8 |
Measurement report number |
Max 78 |

9 |
Luminaire name |
Max 78 |

10 |
Luminaire number |
Max 78 |

11 |
File name |
8 |

12 |
Date/user |
Max 78 |

13 |
Length/diameter of luminaire (mm) |
4 |

14 |
b - Width of luminaire (mm) (b = 0 for circular luminaire) |
4 |

15 |
Height of luminaire (mm) |
4 |

16 |
Length/diameter of luminous area (mm) |
4 |

17 |
b1 - Width of luminous area (mm) (b1 = 0 for circular luminous area of luminaire) |
4 |

18 |
Height of luminous area C0-plane (mm) |
4 |

19 |
Height of luminous area C90-plane (mm) |
4 |

20 |
Height of luminous area C180-plane (mm) |
4 |

21 |
Height of luminous area C270-plane (mm) |
4 |

22 |
DFF - Downward flux fraction (%) |
4 |

23 |
LORL - Light output ratio luminaire (%) |
4 |

24 |
Conversion factor for luminous intensities (depending on measurement) |
6 |

25 |
Tilt of luminaire during measurement (road lighting luminaires) |
6 |

26 |
n - Number of standard sets of lamps (optional, also extendable on company-specific basis) For absolute photometry, this value is 1 |
4 |

26a |
Number of lamps For absolute photometry, number is negative |
n * 4 |

26b |
Type of lamps |
n * 24 |

26c |
Total luminous flux of lamps (lm) For absolute photometry, this field is Total Luminous Flux of Luminaire |
n * 12 |

26d |
Color appearance / color temperature of lamps |
n * 16 |

26e |
Color rendering group / color rendering index |
n * 6 |

26f |
Wattage including ballast (W) |
n * 8 |

27 |
DR - Direct ratios for room indices k = 0.6 ... 5 (for determination of luminaire numbers according to utilization factor method) |
10 * 7 |

28 |
Angles C (beginning with 0 degrees) |
Mc * 6 |

29 |
Angles G (beginning with 0 degrees) |
Ng * 6 |

30 |
Luminous intensity distribution (cd/1000 lumens) |
(Mc2 - Mc1 + 1) * Ng * 6 |