what’s wrong with that ?
A single image doesn’t tell us what your model is like, what kind of lights you have used (point?) or what your render settings are like. In real life, perhaps, the effect of those downlights would perhaps be even sharper, with less light reaching the ceiling.
Have you placed any lights or are you trying to use just emissive surfaces?
It appears to be something with your light and render settings that causes what looks like ‘blotches’. Try different settings like this video and see if that helps: https://www.youtube.com/watch?v=KxgBOkmpqYU
or upload the file and share a link here so someone can take a closer look.