KeyLIGHTS

Appendix B – EULUMDAT File Format Specification

The following table describes the format (layout) of the LDT photometry file. This specification is followed by the KeyLIGHTS photometry file selector.

 

Item

Designation

Number of Characters

1

Company identification/data bank/version/format identification max.

Max. 78

2

Type indicator Ityp (1 - point source with symmetry about the vertical axis; 2 - linear luminaire; 3 - point source with any other symmetry) [See Note 1]

1

3

Symmetry indicator Isym (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

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

2

5

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

5

6

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

2

7

Distance Dg 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

Width of luminaire b (mm) (b = 0 for circular luminaire)

4

15

Height of luminaire (mm)

4

16

Length/diameter of luminous area (mm)

4

17

Width of luminous area b1 (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

Downward flux fraction DFF (%)

4

23

Light output ratio luminaire LORL (%)

4

24

Conversion factor for luminous intensities (depending on measurement)

6

25

Tilt of luminaire during measurement (road lighting luminaires)

6

26

Number n of standard sets of lamps (optional, also extendable on company-specific basis)

4

26a

Number of lamps

n * 4

26b

Type of lamps

n * 24

26c

Total luminous flux of lamps (lumens)

n * 12

26d

Color appearance / color temperature of lamps

n * 16

26e

Color rendering group / color rendering index

n * 6

26f

Wattage including ballast (watts)

n * 8

27

Direct ratios DR 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 (candela / 1000 lumens) [See Note 2]

(Mc2-Mc1+1) * Ng * 6

 

NOTES

  1. Only linear luminaires (Ityp = 2) are being subdivided in longitudinal and transverse directions.
  2. The parameters Mc1 and Mc2 for the luminous intensity distribution are determined by:

 

Isym

Mc1

Mc2

0

1

Mc

1

1

1

2

1

Mc / 2 + 1

3

3 * Mc / 4 + 1

Mc1 + Mc / 2

4

1

Mc / 4 + 1

 

  1. Each field is an ASCII string that is terminated with an MS-DOS <CR><LF> pair.

 

KeyLIGHTS Help