Make a Circle
and fill gradient.
Make 2 circles,
move slightly upper circle
and minus front.
Use "pathfinder" tool
Make it little transparent &
make more shapes.
Create this shape again and cut out middle part.
Make a bordered circle & expend,
use minus front.
Use lines & do same process to make shape.
Results,
something like this
Cloud Banner
Now we create flash light effect
Make circle with transparent outside and transform, use multiple shapes.
Cloud Banner
Make it like this.
Reduce size and
place it.
Another shape.
Make a circle &
use gaussian blur.
Make shadow
It's Ready