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You would need to cut an opening in the wall with a void to prevent the light source from being blocked. I had a similar post at the link below:
http://revitclinic.typepad.com/my_weblog/2009/12/recessed-can-light-fixtures-not-casting-light.html
For this, you should be able to create a simple wall based family containing a void. You could additionally add parameters to control the void size. Simple example:
Video Example: http://screencast.com/t/SvGtu3zeocT
I hope this helps!
Thank you,