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The issue at hand (and let's call this your
minor spoiler warning) is that the lightsaber we see is not the green one that Luke was armed with the last time we saw him duel in >Star Wars: Return of the Jedi, but the blue blade of the Anakin Skywalker saber. Overall, Rian Johnson's explanation makes a lot of sense. The fact that Luke Skywalker isn't actually there, but is instead using the Force to project himself across the galaxy, means that he needs to keep Kylo Ren on his heels. The entire purpose of what he's doing is to act as a distraction, after all. The best way to do that is to piss Ren off, which is something Luke surely knows isn't actually that hard. Seeing Luke at all, looking just as he did the last time they saw each other, has Ren furious so by the time he sees the lightsaber, he's already not thinking clearly. If he were, he'd probably wonder how Luke got the lightsaber, but that's just not where his head is at.
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Source : https://www.cinemablend.com/news/1973220/why-luke-skywalker-used-a-blue-lightsaber-in-star-wars-the-last-jedi