I started with Blackreach's lighting template and then I made the following changes. Yellow highlights were what was changed from the default.
With Lighting turned on in the CK showing the area that is being affected.
With lighting turned off in the CK so I can see the natural look of the areas as they should be in the game.
Can see the actual ingame screens in my gallery ....
I made a custom light... aaJTFarmExteriorLight01 with the following settings
Omnidirectional, radius - 768, colors - all 3 set to 255 (pure white), no flicker or other effects.
For the size of the room, I'm assuming I had to use 2 of these lights and if you lok at the picture coming down in a straight line there is a grey square with a round rug in it for positioning the character for lighting effects to be even. The lights are set at a diagonal along the white squares to the right and left at the point where the next 2 white square join and are met by the 2 black squares.
The lighting scheme in Skyrim is completely different that what is in Oblivion and I was following the template that DesuChan's Store Mod had. Light radius is 300+ larger, and the character is almost standing in the lights where in the original mod the there was a single bulb, at 420 radius and it was stuck up against the wall and the character was able to move back a considerable distance and still have adequate light.
I may try with a softer/warmer light but I don't see any advantages at this point because a lower light will mean the character would need numerous lights to compensate. Dunno I wanted a screenshooting room in my new manor house and this is bigger than want I was expecting but was the best for depth for the darkness needed behind the character.