Why did Luke’s lightsaber change from blue to green?

Why did Luke’s lightsaber change from blue to green? 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 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.
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