The Jedi's of the movies wouldn't stand a chance. A single Jedi of The Old Republic who could cause entire armies to flee with a thought would own all those green boy scouts.
Ah, but the force gives you power over the weak minded. Green Lanterns are chosen because of their willpower and ability to overcome great fear. The Earth GLs alone (Hal, John, Kyle, and Guy) could take out the Jedi order.
True. But that's just one power. The ability to blow up a star with a wave of one's hand? The Ancient Jedi could do that. The ability to resurrect fallen comrades? They had that too. Kind of hard to fight and defeat an army that can't be killed. They had the power of Force Deflect, of which Yoda used a lesser version in Episode 3, that could absorb and redirect any type of energy. So Hal and Kyle could blast at them all day, but they wouldn't be able to do jack to them except get hit with their own beams. They had the ability to buff themselves up so much with The Force, they'd be walking invincible tanks. But most deadly of all, The Ancient Jedi had BATTLE MEDITATION. This little power, once used, had the ability fill all your allies with courage, determination, and skill. It had the opposite effect on your enemies as it depleted your will to fight. And it effected the strong minded and weak minded alike. So if the entire Green Lantern Corp went up against Darth Revan or The Exile, it would pretty much be over for them. They'd be double screwed if they went up against the Ancient Sith. Because their powers were far more deadly.
There's also this to ponder: The Force is infinite. The power supply on those rings are not.
Second, the yellow lightsaber would only work against novice Lanterns now, those who have not overcome fear.
Like Hal Jordan for 50 years?
The Jedi got taken down by some clones with guns.
The Jedi of the movies had become complacent, lazy, and arrogant. All of which breeds weakness and stupidity. They hadn't fought a real war or The Sith in a thousand years. They weren't warriors or soldiers anymore. They were diplomats and cops. So much of their combat techniques involving The Force had been lost or forgotten. The Ancient Jedi would taken Darth Sidious down before he even ran for Naboo Student Council.
The Green Lantern Corps would not be so easy to take down.
I'd read Emerald Twilight and get back to me on that.