Green Lantern: The Emotional Spectrum Explained
When Alan Scott, the first Green Lantern, made his debut in All-American Comics #16 (1940), created by Bill Finger and Martin Nodell, his powers came from a mystical green flame contained within a lantern, which he used to craft a ring. This power ring was magical. Those who followed were not.
With the Silver Age came test pilot Hal Jordan who became the official new Green Lantern in John Broome and Gil Kane’s comics Showcase #22 (1959). Like Alan, Hal got a ring, but this one was given to him by Abin Sur, a Green Lantern who crash-landed on Earth. This alien was a member of the Green Lantern Corps, an intergalactic police force created by the Guardians of the Universe, immortal beings who watched over the cosmos from the planet Oa.
This new Power Ring was powered by the Central Power Battery that was installed on Oa by the Guardians of the Universe, immortal beings who watched over the cosmos. Each ring is charged by a personal lantern-shaped Power Battery–which is connected to the Central Power Battery—and allows those who, like Hal Jordan, were chosen to were one, to tap into the emotional spectrum, specifically the green light of willpower.