1. Right click and select "New" in the "Light" category (also tried the following steps with existing lights)
2. Click on "Add NIF File" and selected welkyndstone03.nif and clicked "OK".
3. Tried to save the .esp or place the new "light" in a cell.
Step 3 results in an instant crash.
I know for a fact a mesh can be used as a light source because several vanilla "lights" are meshes (example: WallSconceTriple01Yellow512 uses the WallSconceTriple01.NIF). http://tesnexus.com/downloads/file.php?id=36968 also adds a new "light" that uses a modified WelkyndItem.NIF as a light source. I've tried using that mesh (both by following the above steps and just copying it from the Malamath.esp) and the CS still crashes as soon as I add the light to a cell or try to save the .esp.
What do I need to do to get this to work?