Ulted twice in a team fight

So, Lux is insane. I just built a ludens echo and then all the magic pen items and a glp. With my runes, at level 16, lux ult was on a 19 second cool down. I actually managed to ult twice in a team fight. Literally at the very start of it, and at the very end of it lol. I'm just saying...it's crazy lol