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Message 1 of 7
07-08-201910:05 AM
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07-08-201910:05 AM
Trying to accurately model a linear LED fixture.
I'm trying to model a linear LED fixture under a bookshelf. Our lighting designer knows that the IES file for this fixture is vital to avoiding a hotspot at the wall when the fixture is installed just an inch or so off the wall face. I was really pleased to see that Qtrans provided an IES file for this fixture (see attached). I was disappointed to see that when I inserted this file into the family it was just a point source. As you can see from the link (https://q-tran.com/product/sw24-4-0/) the fixture is a linear type fixture. Any help modelling this would be greatly appreciated.
Mike
Regards,
Mike
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6 REPLIES 6
07-08-201910:36 AM
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07-08-201910:36 AM
Results usingSW24-4.0_DRY_40.ies.
Play with your Exposure Controls post-Rendering and see if that helps.
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Message 3 of 7
07-08-201910:57 AM
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07-08-201910:57 AM
Thank you barthbradley. I guess the thing that has me stumped is the hot spot I'm seeing at the middle of the fixture on both our renders. Shouldn't a linear LED emit light more uniformly along its length than this? Am I missing something? Hope you're well.
Mike
Regards,
Mike
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Message 4 of 7
07-08-201911:03 AM
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07-08-201911:03 AM
Even the Light Source Definition using the "Line" with "Photometric Web" shows it this way (e.g. light emitting from point).
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Message 5 of 7
07-08-201911:05 AM
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Message 6 of 7
07-08-201911:21 AM
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07-08-201911:21 AM
Since Revit updated their rendering engine 1-2-3 years ago, area lights are no longer rendered accurately.
If you export this to 3ds max and render with a proper render engine (Iray, corona, etc), it will show as a proper area light.
Basically Revit`s new render engine is faster but quite bad for area lights.
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Message 7 of 7
02-22-202104:08 AM
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02-22-202104:08 AM
I'm experiencing the same issue in Revit 2021. Even though the Emit Shape size is defined as a long thing rectangle spanning the length of the luminaire, it renders as a point source.
Preview file
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Preview file
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