Farrell wanted to use the games to build depth for Ireland ahead of next year's Rugby World Cup in France and pronounced himself satisfied after the win.
Farrell said the 2nd XV had been dying for a game for the fortnight since losing their first game 17-32 to show improvement and secure a win. To achieve that was pleasing.
He said there had been no problems dealing with preparing for a midweek game while also keeping an eye on the Steinlager Series decider against the All Blacks on Saturday.
There were a few issues with knocks and injuries in the background, but they took a healthy squad into Tuesday's game and were looking good for Saturday.
"A lot of lads have put their hands up, and that's a great part of the tour. It's seeing people grow, not just on the pitch. Certain things tend to happen on the pitch that can go your way or not.
"But we judge them how they are on a day to day basis, and if they can be a good team-mate et cetera. And we've seen them grow massively. Not just as a rugby player, but as people coming out of themselves within the group," he said.
"That's massive for us for next year."
The most pleasing thing for him from the game was the teamwork. In the first game, some players had been desperate to show what they had and didn't appear to understand it always had to be team first.
That meant it wasn't only being disciplined around the laws but how they played the game.
"Our discipline was pretty poor in that first game, and a little bit desperate at times. They've learned a lot," he said.
That was obvious from how they handled the conditions in Wellington, which he described as 'brutal' with a swirling wind.
"For a young side to manage their way through a game, when things aren't going right the whole time, was tremendous.
"You look at the discipline we had as far as territory was concerned and how our set-piece was handled. Tactically, and defensively, I thought they managed the game as a whole superbly," he said.
Captain and centre Keith Earls said the honour of leading such a young side was huge.
"They get their first win in an Irish jersey down in New Zealand and being able to captain that side was very special," he said.