To me, it doesn't really seem worth giving up increased Radiance time [i]and[/i] double Grenades. I would much prefer both of those with double Fusion Grenades.
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What funny is two firebolts could potentially get you more kills as well if you are good enough. With this though you can force and enemy back to give you some breathing room or even force them away from a weapon box. Everyone has their own strategies and they should be able to use them without complaints, but this is the Destiny community where the motto is "Nerf Now, complain about nerfs later".