The Lightning's deep playoff runs haven't resulted in a Cup win, but they have produced valuable lessons.2014-15Lost to the Blackhawks in six games in the Stanley Cup final.Key acquisitions: Anton Stralman (D), Brian Boyle (C), Brenden Morrow (LW).Gained: A valuable learning moment; the run was unexpected after the Lightning was swept by Montreal in the first round in 2014. Chicago's experience led it from 2-1 down in the Cup final to its third Cup in six seasons.Lost: Lightning brass and fans will always wonder how it might have gone if Johnson hadn't been playing hurt and Bishop (in a coming attraction) hadn't been injured.Learned: Goalie Ben Bishop emerged as a star, as did center Tyler Johnson along with linemates Ondrej Palat and Nikita Kucherov ("The Triplets").Also learned: Don't get cocky and relax against champions. The Lightning scored one goal over final the final two games vs. Chicago, getting shut out in Game 6.2015-16After being up 3-2 on the Penguins in the East final, lost in seven games.Key acquisitions: Few changes.Gained: Andrei Vasilevskiy's first extended playoff experience after another Ben Bishop injury.Lost: A 3-2 lead vs. the Pens. Bishop to injury again.Overcame: Injuries to Steven Stamkos and Anton Stralman, general insurrection and Jonathan Drouin's suspension for refusing to report to AHL Syracuse during his trade-request saga.Learned: Don't relax against champs. Again. The Lightning scored just three goals in the East final's last two games as the big guns went silent. It lost 2-1 in Game 7.2017-18Lost in seven games to inspired Capitals in the East final.Key acquisitions: Dan Girardi (D), Mikhail Sergachev (D), Ryan McDonagh (D), J.T. Miller (F).Gained: Nikita Kucherov emerges as an elite player, contends for league MVP. Andrei Vasilevskiy contends for Vezina Trophy.Lost: The Lightning falls behind Washington 2-0 in the East final, takes a 3-2 series lead, loses all killer instinct, loses badly in Game 6 at Washington and Game 7 in Tampa. The league's top-scoring team is held scoreless in the final two games.Learned: Can't play to lower standard when it matters.