Illuminated weapons of light gives a 8% total increase in damage when compared to normal weapons of light.
Untouchable reduces the cool-down of the super by 30 seconds, which is close to a 16% reduction with T5 intellect, and also increases your armor by 1.
Which is better and why?
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Illuminated in raids, since you have enough time in between each dps phase to recharge your super, extra cooldown or not.