Antaran, why shouldn't you be entitled to give advice?!?!?!? Everybody can help and you solved my problem!

Thank you, the light cone setting with the 3D shadow worked instantly and I have to say that your scene resembles mine a lot regarding the POV and Room and light idea :o) 

I even didn't need to render the light as a separate layer, everything renders smooth even with GI.

THANK YOU! Now I can keep on working doing a happy dance