IES file interpretation - false light distribution

[bjoerka]

It seems that the interpretation of some IES files is not working correct.

 

As to be seen in the example, i used an IES file for an LED striplight, that is defined to represent a luminaire with the length of 1m.

Vectorworks does not recognize this information and the light distribution is shown as a single light emitting point instead of a linear source.

Comparison is done in the actual version of DIALux.

 

[Jesse Cogswell]

I posted about this back in 2022:

Even though luminous area is included in the IES spec, Vectorworks ignores it and treats the custom light as more or less a point source.  I'm guessing that this is a limitation of the Vectorworks rendering engine.  For linear fixtures, I've cheated by having multiple custom lights per fixture, but it really doesn't work well for things like LED tape.  It's unfortunate that using custom lights with distribution files is the only way to get photo-accurate beam/field falloff, but doesn't work correctly for linear fixtures.