If Riot wants to buff Lux, here's how they should do it.

-Lower E duration -Lower E cooldown (at least at later levels) -Lower E mana cost -Buff W's missile speed -Revert the laser change on PBE

Why each of these buffs?

First, the missile speed buff is just because the ability is garbage and needs to move a little faster so you can actually hit your allies with it. It's a QoL change that frankly needs to happen whether or not Riot does anything else.

Then for her E changes - I really like Lux, but the problem with her, I feel, is that she's often either clunky and lacking in things to do between combos. Kinda like Leona and Malphite pre-changes. Remember how both drop their combo and then did relatively nothing for 4-5 seconds while waiting for abilities to come off CD? That's like Lux. The problem is that her zone control gets in the way of allowing her to do anything besides wait, which hurts her ability to immediately respond when attacked. If someone has a Banshee's or an Edge of Night it becomes significantly harder to respond in any way. This is why in higher elo, where you get much cleverer flanks and ways to gapclose, she falls off from a ~48-49% winrate to a 47.5% winrate.

So my idea is to make her a bit more spammy, since that seems to have made a lot of mages stronger overall.

First, her zone control would have to be reduced. Having a 5 second CD on a spell that lasts 5 seconds sucks. It means that she can either manage 2 E's or has to pop one before firing another. So reducing that to either 3 or 4 seconds or having it scale up to there gives melees she might lane against more room to cs early on then still be fairly useful later in the game.

Then lower her E CD and manacost to compensate. Again, to make it less obnoxious for laning I don't think it would be appropriate to lower the CD at early levels but shaving off up to a second at rank 5 would be a godsend. The manacost would also have to be lowered since 130 is a lot of mana to constantly be using.

Finally, remove the laser change because Lux's weakness is a tanky meta that can jump on her and doesn't care about her measly burst (relative to bruisers, that shit hurts as a squishy) and when everyone has Guardian Angel and flat out doesn't die that's not going to do anything for her outside of pubstomping low elo games. However, increasing her DPS, buffing her mana costs and utility, and lowering her obnoxious zone control in lane might.