EULUMDAT

{{One source|date=June 2024}}

{{Infobox file format

| name = EULUMDAT

| icon =

| iconcaption =

| icon_size =

| screenshot =

| screenshot_size =

| caption =

|_noextcode =

| extension = .ldt

|_nomimecode =

| mime =

| type_code =

| uniform_type =

| conforms_to =

| magic =

| max_size =

| developer = Axel Stockmar (Light Consult Inc.)

| released = {{start date and age|1990}}

| latest_release_version = 2

| latest_release_date = {{start date and age|1998}}

| type =

| container_for =

| contained_by =

| extended_from =

| extended_to =

| standard =

| free =

| open =

| url =

}}

File:EULUMDAT example.png

EULUMDAT is a data file format used for specification of photometric data especially intensity distributions from light sources such as lamps and luminaries. The file extension is {{Mono|.ldt}}. The format was proposed by Axel Stockmar (Light Consult Inc., Berlin) in 1990. The format is the European equivalent to the IES file format specified in IESNA LM-63.{{cite book | url=http://webstore.ansi.org/RecordDetail.aspx?sku=ANSI%2FIESNA+LM-63-02 | title=ANSI Approved Standard File Format for Electronic Transfer of Photometric Data and Related Information | publisher=ANSI/IESNA | year=2002}} The data in an EULUMDAT file is usually measured using a goniophotometer. The IES file format is more formally specified and many measuring instruments

support both formats of file.