If it is the background design then that is nearly the same method. Use one vertical and one horizontal guidelines in the middle of your artboard, then go into your Page Options and set your constrain angle to give you the number your light beams. Once you have applied that then draw a triangle to suit you design, with the triangle still selected move the centre of rotation of the triangle down to the centre of your guidelines. Then drag the shape around using the mouse while holding down CTRL and right click to duplicate the shape. Keep doing this till you have gone around a full 360 degrees. Then give your shape a colour and maybe make it slightly transparent with a circular transparency so that the centre is slightly lighter.
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