Doubling the lead before the midway point of the opening period, the third line added another goal when Eetu Luostarinen, after finding some time and space in the left circle, flicked a shot on net that clipped off a defender's skate before floating past Varlamov to make it 2-0 at 9:13.
"Today it felt good," Lundell said of his productive line. "First shift, first goal, so that helps a lot. Overall, I felt like we played even better than last game. The more we play together, the better it feels. We just need to build our chemistry as a line together."
After the Panthers were whistled for a double-minor, high-sticking penalty early in the second period, the Islanders made them pay on the ensuing power play. Digging his skates into the top of the blue paint, Anders Lee, who has done a lot of damage from that area during his career, re-directed a shot from Mathew Barzal past Spencer Knight to cut New York's deficit to 2-1 at 4:27.
With the goals continuing to come from the bottom-six, Lomberg extended Florida's lead to 3-1 when he dropped to one knee and forcefully blasted a dribbling puck under Varlamov's blocker and into the back of the net from the center of the left circle at 2:56 of the third period.
"The boys did a great job being where they had to be on the forecheck," Lomberg said. "The puck just kind of bounced to me, and I just put it away."
On a 5-on-3 power play, the Islanders made it a one-goal game once again when Lee, right around the crease as always, backhanded a rebound past Knight to make it 3-2 at 9:07.
Shutting the door from there, Knight finished with 23 saves.
"It's a tired team, but a veteran team," Panthers coach Paul Maurice said of the Islanders, who played at Tampa Bay on Saturday. "With that, you know the first period is the place you've got to jump on them and then hopefully break something loose. We did a pretty good job with that.
"After the first period, you know it's going to be a much different game, kind of a grinding game. Pretty good. You're going to want to put some pucks in the net on some of the chances that you had, and it was tighter, but these are really important games for us to go through."