Well, it was pre-Parallax by a few years.
In the late 1980s DC was being published in Action Comics Weekly. Eventually they elected to do a GL "Year One" type of story - Emerald Dawn, which would lead to a new GL series. ED was a big success, but while they wanted to build on it, they also needed to get back to the current time period, which they pegged as being 15 years later. So in the first issue of GL vol. 3, they made regular references to the 15 years since ED, and added the white streaks to make the passage of time clear.
Those pages look amazing! Can't wait for that issue.
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