Sadly there's no Gobo, no Projector, no Laser, no Spot... Lights as such (at least not with Corona_Blender). :)
The closest thing would be Mesh Directionally Emitting Textured Light. (don't know what to call it otherwise) :D
To make one:
Add a mesh/plane (UV unwrapped) to the scene.
Use Corona Light Material on it.
Apply texture to the material Emission Color.
Set Directionality somewhere around 1.5~2.0 (the sharper you want it to be, the longer it takes to render/clear)
Set Multiplier to your preference (higher the value, also greater the noise).
Notes:
Textures can be used with IES.
IES matrix is somewhat off:- Translate (Location): to get proper location you have to have
Keep Sharp checked & take the mesh/plane size into account,
- Rotation: to get rotation of 90° enter value 4500°, basically multiply by 50.
- Scale does nothing (Why is there IDK)
- If IES is translated/positioned into the same center/location where emitter/mesh is, self shadowing occurs (*pink).
&comparison VCM vs PT (hint to make composites ;)
scene file attached, IES generated here, used random textures from web (not included)...
hope it works out for you
EDIT:
Ah, Glen beat me to it, thanks :D