It's just the second time the team from Norrbotten, Sweden's northernmost county, has lifted the Le Mat Trophy, and in doing so have denied Brynas a 14th title after they made history by becoming the first newly-promoted side to finish top of the regular season standings.
With only three of a potential seven matches at their Coop Norrbotten Arena, Lulea knew they needed at least one away win in the series to lift the title.
In the end, they managed two, including a resounding 6-2 success in game five, to help them go 3-2 ahead with their final home match to come.
The raucous home crowd were there to see their team become champions, but Brynas were intent on ruining the party and taking the game to a decider back in Gavle.
And that intention led to the visitors breaking the deadlock after seven-and-a-half minutes, when Johan Larsson controlled a loose puck on the right wing, cut inside past a couple of defenders and finished well.
But that was as good as it got for Niklas Gallstedt's side, who lost their advantage within four minutes when Pontus Andreasson inspired Lulea's comeback.
After David Lilja's effort was saved by Erik Kallgren, Andreasson was on hand to force home the rebound, his 12th goal of the Playoffs campaign.
On a powerplay soon after, he was shaping to shoot again, but instead turned provider for Marcus Hardegard to unleash a long-range one-timer to put Lulea in front.
Tempers were threatening to boil over in the second period, as the hosts' Eetu Koivistoinen and Brynas' Oskar Lindblom sent to the box for roughing were two of a handful of penalties awarded.
Amongst all the fouls, there was still time for one goal, midway through the period, and crucially it went to Lulea. Brian O'Neill drove forward from the right side and played the puck into the path of Brendan Shinnimin, who bundled the puck past the goaltender.
Lulea - and O'Neill in particular - settled the match, the series and the SHL season in the first 02:31 of the third period.
In the opening minute, Frederic Allard's pass wasn't dealt with by the away defence, and O'Neill was perfectly placed to apply the finish.
Then, a vital deflection seemed to have scuppered a counter-attack between Shinnimin and Isac Hedqvist, but Shinnimin refused to give the chance up, playing a hopeful pass from behind the net which was met by O'Neill, who scored his second of the match.
A minute later, Theo Lindstein pulled a goal back to complete the 5-2 final score, but it was far too little too late for Brynas, whose wait for a first title since 2012 goes on.
For Lulea, they end a 29-year wait for their second SHL title, and become the fourth different club in four years to lift the Le Mat Trophy.