Grainy walls using daylight system

After using the Skylight and sunlight system, i encountered a problem. The light was not distributed evenly in the room. This made some corners of the room look very grainy as there was no light to compensate it.

Changing the values of the daylight system to compensate the dark parts made the evenly lit parts of the room very brightly lit. To a point where it was hard to see definitions on objects.
I decided to use scrap that idea and use photometric lights with the same colour temperature as the skylight and sunlight systems and put them close to the wall to light them up evenly. the result is below: