This is real. Hero Tech has built a retractable light saber that is using no visual effects. You cannot fight with it but it looks like the movie light saber. The two led light strips are attached to a retractable magicians cane. The internal setup has a motor to rotate the blade and the lights.

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Link :
https://www.nextbigfuture.com/2025/05/this-is-real-a-retractable-light-saber-using-no-visual-effects.html