Quote Originally Posted by GideonHighmourn View Post
That's incorrect. The skill only effects Cast Times, lowering them by 20%. It doesn't increase the "Spell Speed" stat on the attributes window anymore. Similar to the new Selene buff, it acts as a "haste" effect, but doesn't effect the actual spell speed stat.

Also, Light Speed is great for a spell like Stoneskin or Ascend, however, using it on heals is fighting an uphill battle. While it lowers the cast time, it doesn't effect the GCD (AFAIK), coupled with the -25% potency decrease, you're fighting an uphill battle trying to keep up with damage.
Really? I could have sworn Presence did Spell Speed. Maybe they changed it during the patch?

Also, because you'll be spamming spells after using Lightspeed, you'll burn through more MP. Having said that, Luminiferous Aether does have an advantage over Shroud of Saints, only having a 120 CD versus Saint's 180 CD.