it will work fine. I'm going to check if the problem is in using a Loopsubdiv object as light source
Ok, found the problem: it is a bug in Luxblend.
Luxblend correctly forbid the creation of a Loopsubdiv as light source however there is a bug. If you enable Loopsubdiv when material is matte and than switch the material type to "light", the light source will still be exported as a loopsubdiv shape.
To fix this problem in your scene just switch the light material back to matte, disable subdivision and than switch back the material to light.