Impressive results!
of course, the computer was now processing 60(!!!) at the same time cones with transparent textures. Hard work for the machine.. 
Maybe you could solve that by using a different diffusing image: a long stretched triangle that dissolves along its edges. Then use that image for each beam. More images instead of the single circular dissovling circle but only one for each beam instead of the 60. It also has the advantage that you can adjust it for multiple beams in different directions and and angles like on a stage.----------------------------------------
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