how to do fast lighting test renderings

[nodar1978]

hello guys, still need advice from you,

how can i do fastest renderings to test lightings. and so colours. which parameters plays big role for rendering time?

and one more question: when I've got big space and few room in one view, it's difficult to set lightings, when i do lightings for one room, it is not good for other, and so i have to make always prerenderings, and it takes lots of time, is there any basic and simple rool how to set up lights in scene, so they will be smoothly for all, or how can i decrease quantity of lightings in scene and get good result.

P.S. and i dont like these dark parts of the room, help me to bring nice lights in scene please

thanks