Tutorial for the use of the Innerscene Virtual Sun A7 LDT and IES files
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This article is intended for professional lighting designers who use light modeling packages such as Dialux or Relux. We provide options to model Innerscene Virtual Sun Model A7 in models for light level studies and/or visualization of both intensity and CCT within an environment.
The LDT and IES files of the Innerscene A7 lighting fixture are synthetically generated. Measured photometric data is expected to be available in the future, however results of lighting simulations with the synthesized photometrics have been verified with “in field measurements” and have proven the synthesized photometrics to be within a margin of +-10%. We have had to slightly expand the sun beam divergence angle in the IES & LDT files because light simulation packages were not designed to handle this type of light fixture.
LDT files and IES files linked above are available for your renderings and simulations. If your software allows for the use of LDT files we suggest you use the LDTs, as these also include the respective correlated color temperature (CCT) of the lighting unit.
IES files do not allow you to specify CCT in the file format. Using the IES files you can still manually adjust the CCT to the correct values in your software if your software allows it.
The Innerscene A7 lighting fixture produces two types of light outputs which have different CCTs, luminous flux, and beam angles.
For modeling purposes we have provided two options.
This is an easy option can be used if you only care about lux levels for light level studies
This option is more appropriate for visualization purposes where room CCTs are needed.
If you need to generate a lighting simulation with emphasis on the correct lighting levels and the appearance of a 3D render in the simulation is not as important, you might want to use the combined photometric files which can easily be imported into Dialux or other as a single IES / LDT file.
These files (A7-combined.*) have both lighting distributions incorporated into one photometric file. This is easier to handle in the software and will reduce the occurrence of software bugs. This approach will lead to correct lighting levels and lighting distribution. The combined file, however, can handle only one correlated color temperature for the combined lighting distribution. The resulting render would look similar to these where the sun and the sky light have the same CCT.
If you want to produce a visualization of the effect of using the Innerscene A7 lighting fixture in a room, modeling the different CCTs of the sun light and the sky light are crucial.
For this scope the two lighting effects (SUN and SKY) have been separated into two files (A7-SUN.* and A7-SKY.*) and given their respective CCTs. The two files will be placed in your simulation or rendering geometry one over the other, in the exact same position. The reason for this procedure is that neither LDT nor IES files can cope with two different CCTs in one single lighting distribution.
By inserting the two files into your environment, your visualization will correctly show the different CCTs with the different distributions, a cold white light emitted by the sky and a neutral white light emitted by the sun.