You should probably be looking at the changes.md reprinted in the original topic for testing ideas. It has been edited many times.
In the changes is:
Hemi light type is no longer supported. To get a BJS hemi light use area type, & specify Size X for range. So you can still export a Hemi. Probably important to log the BJS type of light in the log file, not the Blender type. I have that on my list of to do’s.
I am pretty worried about how late in the dev cycle I noticed lights were so different. Probably not a good idea to File->Append lights. Keep to meshes, which will also drag materials (probably worthless) but the textures also come across too. This makes creating a Nodes material easier.