If I understand the shadow on the ceiling correctly, you could turn on shadows on the interior light and then select the fixture above the light and turn off cast shadows. That will allow the light to shine through the fixture instead of casting one big shadow. Let me know if you need more detailed instructions.

For the outside light, select it and then in the attribute editor you can increase the intensity of the light and also the area of coverage. If your outside light has decay, then you will most likely have to increase the intensity DRAMATICALLY.