I finished the raid for the first time last night after 4 3/4 hours. I was 365 and had two other team mates in their 360s and then the rest 370+. Yes it took us a long time on Aksis, more so, than the rest of the raid, but that wasn't due to light. We had to learn the mechanics and then use that knowledge. Light isn't everything.
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Light is a lot more dps though