The Lightning's power play made it two goals in three tries (the one they missed was just 19 seconds) when Pavel Kubina teed up a slapper from just above the right faceoff dot and blew it past Brent Johnson at 2:54 for a 6-0 lead.
It became 3-for-4 on the PP when Kubina set up in front of the crease and tapped home a pass by Purcell at 5:45 for a 7-0 lead.
At least the Penguins spoiled Dwayne Roloson's shutout bid. Mike Rupp chipped in a rebound at 6:36 to get the Pens on the board.
The Lightning have outscored the Penguins 12-2 in the last five-plus periods in Pittsburgh after a 3-0 loss in Game 1. It's an amazing turnabout -- Pittsburgh won both regular-season meetings at home and outscored the Lightning 13-2.