Hi SHL,
Bixarrio is right about the limited number of light sources.
For lights that are just decoration and that do not move, I would recommend to learn how to bake the light. You can find tutorial videos on Youtube. Baking the light will allow you to use multiple light sources in your scene, and it is more performant than realtime lighting in the scene.
See also:
- Forum User Guides : How to mark a topic as solved