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In Star Wars- Episode IV- A New Hope Luke's lightsaber has a light blue color, almost white, however in the prequel films the same blade is a dark blue instead.

Here's the blade in A New Hope:

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and here it is in Revenge of the Sith

enter image description here

Is there an in universe reason for this change in color or is it simply a byproduct of the newer out-of-universe production techniques of making the lightsabers?

Update: The same lightsaber is once again deep blue in The Force Awakens:

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Seriously, I cannot make out any differences in those lightsabers, blue is blue. The explanation that the technique for making those effects changed is probably the most likely (though, good will keeps me from downvoting for now). – Napoleon Wilson Jul 9 '13 at 15:59
As a side note, colors on an object can change based on the lighting in a room. Colors from a light source are subject to the same effects. Additionally, one presumes that the color of the plasma would be effected by the temperature of the blade and the atmosphere in the room - different gases have different spectrums. Given that it also lists crystals on that page.... perhaps, in universe, it could just be the age of the saber? Out of universe, it probably is just the technique... – Clockwork-Muse Jul 9 '13 at 16:09
Close Vote - There is no major difference in lightsabers. – Ankit Sharma Jul 9 '13 at 16:30
Anakin's lightsaber has been sitting in Ben's dusty hope chest for 20+ years. Its battery is a bit flat. – Nobby Jul 9 '13 at 19:26
The close votes seem to indicate that most people don't see a major differences – Liath Jul 10 '13 at 8:11
up vote 7 down vote accepted

As @Jared points out in the comments, differences in the color of lightsabers between the Star Wars episodes, can be attributed to post-production. There is no canonical (in-universe) reason for these color differences.

For example, and taken directly from the question that Jared linked to... It's Green ...before the last edited release on Blu-ray in 2011, it was made green (on the 2004 DVD edition). More than likely, if you are watching a copy of Star Wars that was released before 2004, you will find color differences from scene to scene. The 1997 Special Edition and original version, the same lightsaber in this scene is white.

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