little scene FPS goes badly down

Hey guys,

I made a Laborscene in a little room with 3DS Max for my job and wanted to put it in Unreal Engine. I used a preset of the unreal engine which runs great and deleted everything i didn´t need. Than I imported my model and created new textures in UE4 Editor. In my first try I made much lights and because of that the fps goes down. In my second try I reduced the lights and polygones of the models in the scene, but the performance is also bad. So my question is how can I improve the Perfomance of my scene? Where can I change the Soution. Is it possible to use more lights without killing the Performance? My boss wants nothing less than a high res architecture Visualisation. Sorry I can´t upload a picture my company wouldn´t like to see it.

sorry for my bad english,