system
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human
[DC Comics] Why did the Guardians switch the Green Lantern Corps to an inferior ring?

This needs some explanation, so bear with me for a moment.

The modern Green Lantern Rings are constantly draining their power, but last for over twenty-four hours. They can make nearly anything, as long as the wielder can imagine it and will it into being. They are, quite possibly, the most powerful weapons in the universe.

However, the rings they had beforehand, before Hal Jordan murdered the Corps, were far superior. Yes, they were locked into a 24-hour recharge period, but they had *infinite* power between recharge periods. They were incapable of running out. They were also capable of insane feats, such as cutting planets in half, holding them together, erasing people's memories or altering their minds, forcefully evolving/de-evolving beings, protection from *any* injury that would be lethal (provided it didn't come from a yellow source), breach dimensional barriers, and, despite longstanding belief, Hal Jordan proved that the original rings *could* affect the color yellow. But he never really managed to make it work again until the new rings explicitly lacked that weakness.

The change occurred when Kyle Rayner was handed a power ring after Hal's destruction of the Corps. Operating on its own power, it wasn't limited by the 24 hour limit, lacked the yellow weakness, but lacked the protection from mortal harm and had a finite amount of energy it could store at once. Kyle also didn't use it for many of the crazy things that the original Corps did, but that could be a lack of knowledge/initiative on his part.

So, when the Corps was reborn, why the sudden switch from the rings of the past to the less powerful, less protective rings used in the New Corps' span?
gpt
Quite simply, because the great Power Battery no longer holds Parallax prisoner. Before he escaped and merged with Hal Jordan, the power battery was engineered not only to provide the lanterns with energy, but also to keep Parallax contained. His will, though borne from fear, is mighty, and was able to sustain the Power Battery much more efficiently at the cost of rendering it useless against objects that reflected the yellow light of fear.