This can be seen in the novel starwars.wikia.com/wiki/Rogue_Planet. It's because of his mastery of sorsue (sorry for my bad spelling.) Well if you want the ACTUAL reason it because in the original 3 films the Green Light Sabre didn't exist until after Obi Wans death.
After being promoted to Jedi Knight, Obi-Wan Kenobi rebuilt his lightsaber in the style of his first lightsaber, which was lost during the Second Battle of Theed in 32 BBY in his duel with Sith Lord Darth Maul.
During his years as a Jedi, Obi-Wan Kenobi fought with three lightsabers. His first had a blue plasma blade and a hilt similar to that of his master, Qui-Gon Jinn. Obi-Wan used this weapon until Darth Maul kicked it into a deep shaft on Naboo. He then constructed a new, blue-bladed lightsaber with a similar design.
What does it mean when a Jedi has a blue lightsaber?
Around 4000 BBY, lightsaber focus crystals were used to indicate a Jedi's chosen class. Blue indicated a Jedi Guardian, a Jedi who used the Force on a more physical level. Green indicated a Jedi Consular, a Jedi who preferred to reflect on the mysteries of the Force and fight the dark side at its heart.
Every Fine Addition in General Grievous's Collection [EXTENDED]
What is the rarest Jedi lightsaber color?
In a galaxy filled with lightsabers of various colours, the Darksaber stands out as the rarest lightsaber colour, shrouded in mystery and steeped in history. Created by the first Mandalorian Jedi, it has passed through the hands of warriors, terrorists, and heroes, leaving an indelible mark on the Star Wars universe.
Obi-Wan Kenobi was one of the most legendary Jedi Knights in the history of the Jedi Order. He wielded a blue lightsaber throughout his long career, using it to battle against the Sith and other enemies of the Republic.
After destroying the Jedi Temple in 28 ABY, Ren used the dark side of the Force to bleed his lightsaber's kyber crystal, changing the color of its plasma blade from blue to red.
In the original 1982 teaser trailer for Return of the Jedi, the color of the lightsaber was blue. The decision to change the color of the lightsaber from blue to green was made to make Luke's blade contrast with the blue sky of Tatooine and make it more visible during the skirmish at Carkoon.
The single blade was a dark red color when the weapon was first presented to Darth Bane, though Bane later swapped out the original crystal for a synth-crystal which was provided by Qordis, producing a crimson blade.
Inside, two lightsabers have been laid to rest. One was Kenobi's during his time as a Jedi Master; the other belonged to his apprentice, Anakin Skywalker, before his fall to the dark side.
Qui-Gon's apprentice, Obi-Wan Kenobi, then used the same lightsaber to defeat Maul after losing his own. After the battle, the weapon was later returned to the Jedi Temple. With the advent of the Great Jedi Purge, the blade again fell into the possession of Kenobi, who went into hiding on the planet Tatooine.
Single-bladed lightsabers are the most common lightsaber, being efficient and deadly. This was the saber Kylo Ren learned to wield at Luke Skywalker's new Jedi Academy. However, the reason Kylo's blade is crackling is because the Kyber crystal was fractured as he bled it, turning the blue blade red.
What happened to Obi-Wan's lightsaber after Vader killed him?
With his death, Kenobi vanished into the Force, leaving behind his robes and lightsaber. Afterward, Vader picked up his former master's fallen blade. Kenobi's second apprentice, Luke Skywalker, later used his weapon's design as a basis for the construction of his own lightsaber with a green kyber crystal.
As explained in our article about Obi-Wan Kenobi's lightsaber color issues and a VFX artist breakdown of the problem with the blue lighting, the combination of a digital camera sensor and bright blue (and red) LED lights resulted in "chroma clipping" that broke the color data in numerous lightsaber shots in Obi-Wan ...
The black lightsaber, or Darksaber to give it its proper name, is one of the rarest lightsabers in Star Wars canon. Despite its rarity in canon, anyone who has seen the second season of The Mandalorian is likely to be familiar with the Darksaber.
Leia Organa's lightsaber was a blue-bladed lightsaber powered by a kyber crystal in the core of the hilt. It was silver and copper in color and featured mother-of-pearl inlays. Organa's weapon was considered a work of art, having an elegant symmetry with silver and gold hues that evoke to her upbringing on Alderaan.
History. Like many Jedi did for hundreds of years, Yoda built his lightsaber under the aegis of Professor Huyang, an architect droid who had been with the Jedi Order since its nascent days. As a first step, Yoda acquired a kyber crystal from the icy caverns of Ilum, a mission that proved to be very eventful.
In the final moments of The Rise of Skywalker, Rey ignites her new lightsaber and reveals its yellow blade. We don't know where she got that kyber crystal, but her color choice lines up with her being the new guardian of the Jedi traditions.
Kylo Ren's obsession with Vader is clear, but Star Wars never explained how he acquired the helmet. It is speculated that he may have found it himself on Endor, or it could have been passed down to him by Supreme Leader Snoke.
Cal Kestis, a powerful Jedi featured in Star Wars video games, is yet to appear in live-action projects despite his popularity among fans. His absence raises the question of where he could potentially appear, with a continuation of Obi-Wan Kenobi's story being the most likely option.
1. Anakin Skywalker. Anakin Skywalker was one of the most powerful Jedi in the galaxy, with incredible dueling skills that were unmatched by any other lightsaber user. He was a prodigy who was able to hold his own against multiple opponents, including Count Dooku and Obi-Wan Kenobi.
