If there is any definitive run on GL that competes with Gil Kane, it's Neal Adams. So much so that Adams' interpretation of Hal Jordan as GL almost eclipses the character itself.
If my studies here look a tad wonky, I can't claim any defense. Working from Adams is quite difficult, the level of detail shown in Adams' renderings looks loose and effortless on paper but is assuredly not in reproduction. Adams is one of comics' master draughtsmans, and while a tough exercise any artist would do well from a lesson or two.