The Canadian international first arrived at the Lane towards the end of last season and featured as a first team substitute in the absence of Neil Sullivan.
He returned to Calgary Storm during the summer months before being invited back for a second trial spell that has clinched an 18-month contract for the goalkeeper with options to extend his stay.
"It's been a long process, but it's done and I'm happy about it," said Lars at Spurs Lodge.
"It's finally done, I didn't know what to expect when I came back here a second time but it's worked out well."
Lars agrees that being a goalkeeper on trial brings a pressure all of its own, with little room for error.
"Exactly, you never know. You always hope the boys in front of you will help you out a little bit and make you look good. For me it worked out well."
First team coach Chris Hughton explained that the staff have been particularly impressed by the 23-year-old and said he had caught the eye.
"All you can ask when somebody comes here on a trial basis is for them to catch the eye - and that is exactly what he's done," said Chris.
"I would have to say, in the period of time he's been here, he hasn't done too much wrong. We all know with keepers that you can be good or bad - you're either saving shots or letting them in.
"In the time he's been here he's impressed us enough to offer him terms and he hasn't done too much wrong.
"He's one who's still developing, this is his first experience in the English game. He is an international goalkeeper, but there are lots of things he's got to get used to.
"So far he's adapted very well."
Although a Canadian international, Lars does not require a work permit as he has German citizenship.
The club completed another transfer before the weekend deadline, securing the services of goalkeeper Lars Hirschfeld after an extended trial period.