i have put a spotlight in the scene as shown in the lesson, along with a similar HDRI. however, when i turn the World off, though the Preview renders correctly with a hard-edged pool of light from the spotlight and almost no GI:
however, the final render has lots of GI and no sign of the spotlight:
i have checked the Restrict Rendering buttons (camera icon) in the Outliner and they are all switched on. i am using Cycles in B2.79. i must be doing something dramatically wrong, but i cannot figure out what it is. any thoughts gratefully received.
