Lux could use a slight QoL buff!
With the substantial nerf to Athene's Unholy Grail, Lux players are forced to either itemize for a weaker early and mid-game with tear or lose out on some of Lux's ability to spam her already lengthy-cooldown spells. I think this is quite a healthy gameplay decision that Lux players are forced to make, and her high mana costs shouldn't be changed. Instead, it would be really cool for Lux's strengths as a light mage to be emphasized with a quality of life change.
I suggest slightly increasing the range of the vision granted by Lucent Singularity and Final Spark and increasing the linger duration of the vision granted by Final Spark. An extended vision radius for Lucent Singularity would further highlight Lux as the premier light mage (and light means vision!) in League of Legends. Plus, it would be really cool to see that theme of light and vision stand out in her gameplay. A short lingering vision on her ultimate after it fires makes sense since its cooldown has been increased since her release, and would be quite useful for lighting up areas of the jungle that may not be warded during an extended teamfight.