Delete spellsnew.eff and spellsnew.edd from your install dir. Remember to re-delete them after each patch.
This gets you to pre-velious spell effects, which were amazing but on big raids were just a bit too nutty.
On vanilla and kunark era planes raids... holy shit things were out of control with no way to turn them off IIRC, but I loved the chaos, like a hate break needed any more!!
Unfortunately sometime in the last few years, they changed the
shape of the spell effects, so they are no longer completely original.
e: It looks like the ones in that YT video are post velious, low poly count.
Here's what they really looked like, this is from EQMAC (RIP).
[ame]https://www.youtube.com/watch?v=Lpq2CCuNMgI[/ame]