Lux ultimate CD needs nerf?

Hello everyone, as a Lux support main, I highly feel like her ultimate is way too strong and I'm not even building full AP and yet I can pretty much demolish enemy ADC if caught in Q, Ultimate then E. Ok but her kit is fine overall but her ultimate is easy to land, deals significant amount of damage and has 36 second cooldown... My idea would be to increase her cooldown on her ultimate and make it deal less damage on enemies hit behind the first like Ezreal.
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