This is Tampa Bay's third conference final in the past four seasons and fourth since 2011. Washington hadn't reached the conference final since 1998.
Tampa Bay has 18 players with a combined 273 games of conference final experience, led by forward Chris Kunitz (26), who has won the Stanley Cup four times, including each of the past two seasons with the Penguins.
Defenseman Anton Stralman has played 25 conference final games, and defensemen Braydon Coburn and Victor Hedman each has played 21.
Eleven Lightning who won the 2015 conference final against the New York Rangers are expected to be in the lineup Friday. Tampa Bay's Jon Cooper has coached 14 conference final games, going 7-7.
"There is an obvious excitement about being here again, but it's kind of a different excitement," Cooper said. "It's more 'We're on a mission' excitement. It's a little different than it was three years ago with the same group. There's a confidence about them in the way we're playing, how we've arrived at where we are right now, and a lot of that has to do because they've just been there before.
"Now you get to take a step back and say, 'OK, what has worked for us before and what hasn't?' If there was a panic button in 2015, there doesn't seem to be one in 2018. It's all part of just because we've gone through that experience a few years ago."