Area light problem

[gardrew]

Hey guys! I have a few problems that I can't seem to be able to figure out:
I made the first rendering, 7 hours, and everything was almost ok, but I wanted to try a brighter image with different colors. I changed only the Watt and RGB values, but now I can't seem to figure out what to do for my light on the wall not to appear in lines as in the second picture, and also to keep the crisp (white) colors of the paintings as in the first picture, because now they seem like they lost some of the colors and blended together. I tried changing back the light intensity, tried changing the colors of different objects, tried setting the light sources to emit colder light, but nothing seems to work.