I'm not sure, but I gather that the "halo lighting" isn't really a thing that the fans go rabid for. "Light The Halo!" has never been a thing that I was aware of. And therein may lie a difference.
Angels do a Thing, everybody pretty much ignores it or at the very least doesn't make a deal about it, Angels just keep doing it because it's just an arbitrary, barely-noticed Thing.
For that matter, basically all baseball teams do a 7th inning stretch and play Take Me Out To The Ballgame...but it's just a Thing. 50% of the people wouldn't even notice if it got skipped - including me. The last baseball game I went to, the middle of the 7th rolled around and people started standing up and I was like, "Oh, yeah, we're all going to do the Thing." If it hadn't happened, I wouldn't have noticed. Have I been to a baseball game where it DIDN'T happen? I don't know! Maybe, but I wouldn't have noticed. If the Angels didn't light up the halo one night following a win that I knew happened, would I (as a hypothetical SoCal resident) notice driving by on the 5 that it was dark? No chance.
Kings do a Thing that can hardly be ignored, market it to the roof (literally), the fans go crazy over it, they chant for it, they post about it incessantly on social media, Thing becomes a brand-centered culturally-significant Phenomenon. People go outside their homes miles away to see if they can get a glimpse of it (for the record, on a clear night from the fields north of Davis, no...maybe if there were some cloud cover to catch it). National media write about it. There are images, and memes. Crazy people go to the trouble of editing animated .gifs like this:
Or like this:
We are definitely dealing with two different classes of, for lack of a better category to fit them both, Tradition.
Clearly just a Thing can carry on for a long time. But it's pretty likely that a Phenomenon cannot be a Phenomenon forever. Humans have too much of a penchant for novelty for forever to happen. So then the question becomes, what happens when the Phenomenon is not a Phenomenon any more? One possibility is that it just becomes a Thing. But another possibility is that it begins to look old and dated in a way that something that started out as a Thing never does, and it has to be dropped. Which happens? I don't know. How long before it begins to come to a head? Well, I'd wager that it won't be before this Sacramento era's championship window is closed. Hopefully that's 10 years and 3 rings down the road. But for all we know (God forbid) it could be next year we're rebuilding again. But my guess is that The Beam is the symbol and identity of this upswing. The Webber/Peja/Divac years were the Glory Era whose gimmick was the Bench Mob. The Fox/Sabonis/Murray?? years are the Beam Team. After that, we probably let it go. My guess.