9-42 max on any 25.5" scale guitar.
That Beato video above is interesting. I remember in the mid '70s when I first started playing pretty much everyone used 8's. Maybe once and a while 9's, but guys like Jimmy Page and everyone else used 8's or even lighter, so by god that's what we all used. Then for whatever reason everybody went to heavier strings - maybe it was the Stevie-Ray effect, I don't know - and it somehow became common knowledge that heavier strings sound better.
But listen carefully in that video and its pretty apparent that every time they go down a gauge the tone improves.
A couple years ago I started using 9s again after like 20 years of using 10's. It was like removing a layer of muck from my tone. Plus, they just feel so much better and I don't rip my fingertips up as much. I think I am going to give a set of 8's a try on one of my guitars just to see how they stack up to the 9's.