Short Round said:

Harmy said:

now I've compared the sabres there with a scan of an I.B. Print and the glows are definitely not the originals, which were much more diffused but the cores actually look very close

What do the originals look like? I always remembered the video tapes being the fat cores of the lightsabers.

Yeah, in the I.B. scan, the thickness of the cores is pretty much the same as in that RMV video but the glow is far far more diffused - there is no clear edge to the glows - at least in the shot I was comparing.