Q: What is the best way to create a drawing with my light fixtures or diffusers that I can send to the architect for his reflected ceiling plan?
A: Use the DM HVAC/Electrical->Utilities->Copy Drawing and Remove Links to Database command. Erase everything from the drawing except for the light fixtures or diffusers you want to send to the architect.
The copy command creates an exact copy of the drawing, but disconnects it from the database. Deleting devices from the drawing will not remove them from the database. You are free to make all the changes necessary for the drawing you want to send to the architect without having to worry about what will happen to your database.