It would help if you made it clear what you want fixed.

If the light is too bright/powerfull you can modify the light model. In the bottom right corner there is a setting "Light power (%)" that is default set to 50%. You can change that number to get more or less light power when rendering a photo.

If it is the spread of the light then you need either a different light or add a invisible lightpanel or hemisphere. Read this very educational thread from GaudiGalopin about using invisible hemispheres to light a scene.
Unfortunately all images are lost because the file host disappeared but you can still learn a lot from the text.

PS
Please remove your double post, the one without replies.