The bottom shot, IIRC, is based on Adywan's corrected version. I think he, like many of us, were somewhat corrupted by years of watching Empire. The glow in the upper pic could be a little more saturated, probably a hair less green, but it seems to have originally tended more towards bluish cyan than true blue.

It's always been difficult to determine that perfect hue that's not *too* blue, but at the same time not too greenish either.

Also keep in mind, it would not have looked exactly the same from shot to shot - even though it was more consistent originally than it is now, every shot wouldn't have completely matched when put side by side. (For example, long before the SE, I think I noticed Vader's saber tending towards red-orange in a couple shots, rather than pure red.)