Looks like Gibbons' GREEN LANTERN run was a fairly short one, from 172 (Jan 1984) to 186 (March 1985).
Plus backup stories in 161-162, 164-167.
https://readcomiconline.to/Comic/Green-Lantern-1960/Issue-172?id=28110

I love this site, where you can read all the issues of pretty much every major series online.