Martin St. Louis, Pavel Kubina and Ruslan Fedotenko scored the other goals; Ryan Craig had two assists; and goalie John Grahame made 30 saves for the Lightning (36-28-4), who have won two in a row and three of their last four games.
Alexei Yashin and Bruno Gervais each scored a goal; Jeff Tambellini, Wyatt Smith, Robert Nilsson, and Jason Blake had assists; and goaltender Rick DiPietro made 32 stops for the Islanders (31-32-4), who have lost three in a row on the heels of a four-game winning streak.
The Lightning out-shot the Islanders, 37-32.
Tampa Bay went 2-for-7 on the power play. New York was 0-for-1.