How would you go about recreating the textured plastic look on light fixtures?

I want to recreate the look in the attached photos- specifically the look of that ridged and slightly opaque plastic with the light source barely visible underneath.

Would you be able to do this just with a normal map? Would the plastic layer have thickness or would it be better to just have a flat plane? Also when it comes to adding a light source would you place it just outside the actual light fixture? I’ve found it creates some weird shadows when this happens.