Opacity with roughness?

I have a lamp shader with some opacity:

How can I have the some roughness with my opacity?
I want the light bulps to shine through but not as sharp I see them now.

Hi @pekka.varis! Which application are you using to render this? I want to make sure I direct your question to the right person!

this time I use create, but I shall bring this to machinima when all design is done