The strength of the green energy that powers Kyle Rayner'sGreen Lantern and other members of the Green Lantern Corps is based on the willpower of the user. While users are chosen for the depth and strength of their will, some are just more determined than others, and that variance is often the difference between life and death in the DC Comics universe.
Of the seven known cosmic energies that comprise the Emotional Electromagnetic Spectrum, green energy is the one that seeks to harness its users' self-control such that they can overcome or limit the effects of fear, anger, bias, and other emotions. With self-control, a user is literally able to do anything they set their mind to accomplish. This makes green energy one of the more powerful forces in the Spectrum. It also makes the users of green energy, namely the Green Lantern Corps, some of the most powerful beings in the universe. However, the strength of a Green Lantern is not measured in physical strength, speed, or durability but rather in the depth of their will.
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Accordingly, the strength of a power ring construct can be distilled down to the simple formula: degree of willpower + green energy = strength of a construct, with the only variable factor being «degree of willpower.» That is, the stronger a member's willpower; the more they will be able to do with green energy, and the stronger their power ring energy construct will be. One of the best illustrations of this occurred in Mark Waid and Bryan Hitch's JLA (1997) #55. There, Kyle Rayner's Green Lantern is called on to protect a city from the explosion of a nearby nuclear power plant. Not only does he protect the people from the actual
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