So it looks like the Enlightenment Aura is no more, but anyone who owned it will have it replaced by the new Illumination aura.
Information can be found via the link above ^.
There's some interesting info there.
For example every 5th activation you can get double xp for 1 hour per day (BXP does not work.)
So even if you don't want to use the aura for an hour each day, you basically want to activate it & then remove it, if you've got other things to do with other auras.
For now I will say keep count! Until we're sure we'll get like a counter or some sort of notification when we are about to activate double xp.
Also:
Bonus XP will not be used while the Illumination Aura is active.
On +10% activations, any Bonus XP that you would have earned will be given to you as a lump sum once the activation ends.
On +100% activations, Bonus XP usage is disabled entirely for the duration, and is not given as a lump sum.
To me this reads as any bonus xp you would have got will be applied when aura becomes not active.
It says it's given as a lump sum at the end, but doesn't say the corresponding amounts will be deducted from your BONUS XP totals.
But that would seem like an op aura if that was the case, so I don't feel I know exactly how it is going to work currently.