I'm using these in my high beams on my '00 XL:
http://a.co/d/9PCwhZl
View attachment 207075
They claim to be 8000 lumen, but I'm guessing they are closer to 3000 lumen a bulb. They are brighter than the HIR 9011 halogens, but not as bright as the 35w HIDs that I have in my low beam projectors (I feel sorry for anyone driving around with 15-20 year old stock Denali projectors with stock bulbs).
I bought them because of the lack of space behind the lights to fit a big fan, I have had then since June of '17 and they still work great in my high beams, and seem to have the same light pattern.
I would also recommend a relay kit for the headlights on anyone's vehicle. My dad and I upgraded both our trucks, and the headlights on both appeared noticeably brighter (relay on one side, stock wiring on the other). He has a '98 Sierra, and I have a '00 Yukon XL.
Your Mileage May Vary.