Do You have to build light when not using shadows?

Hey ! Do I have to build light when I don’t need any shadows in my game ?
Basically whole game is 2d and I need to light up sprites.

After building light (simple directional light) everything is black, but in editor preview before building light it is okay, every sprite can be seen. Yes i have Lit material on sprites.
Thanks in advance! Peter

Static and Stationary lights require building.
Try changing your light to movable.