I like to model a pinball light as you can see in the picture. Modeling it is not the problem but how can you get the inner pattern modeled. I don't know how you call that.
(Using Blender Cycles)
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I have slightly different method then @user3800527 it's quite similar but I've started making this answer before so I'll just post it.
Before proceeding further enable F2 add-on in User Preferences.
It's almost the end. Select all and press Ctrl+N to Recalculate Normals.
Select only outer faces, choose Shading > Faces > Smooth and turn on Auto Smooth in Data tab.
For lightning I have used HDRI studio environment, as for example this one:
HDRI studio - this one is free to use. I've used one that I've created by myself.
For material I've used Principled BSDF from Blender 2.79 RC2 with this settings:
Note that results may vary based on Camera angle, HDRI image and it's strength, object thickness and such.
I think you mean the top circle ?.
When you got it you might do..