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Revit currently uses a room area method to calculate light levels in a space. This approach is severely limited with regard to non-uniform room shapes, and does not show the potential dark spots in such areas. To have the ability to do point by point calculations in the model, would be a huge time saver. Currently we, (and assume most firms), are using a third party software to do these calculations. An added advantage would be to use the surface reflectances that are already input the model by the architect.
I have trialled ElumTools which was pretty good. The documentation could be a lot better but the core functionality is good, it works well within Revit and has been available as a Revit plug-in for a few years so it has some pedigree. The calculation time for large rooms needs to be improved.
There is also ReluxCAD for Revit from Relux but it is pretty awful to use and you can't use any photometric files apart from what is already in the Relux database which severely limits it's usefulness. It needs a lot of development before its worth bothering with as it is pretty broken at the moment although it does calculate quickly.
There may be others I don't know about of course.
It would certainly be nice to be able to run detailed calcs in Revit without having to faff about with import/export of GBxml files, a lack of furniture etc in the lighting design software. I believe DIALux has a way of importing 3D geometry into Revit but it is just dumb cubes which are useless.
