The first
The 2007 Lexus LS 600h L had the first all-LED headlamps in a production car sold in the US. Prior LED lighting was limited to DRLs and tail lamps.
The rollout
By 2015, LED low-beams were on most luxury cars. By 2020 they were on most mainstream cars. By 2024 LEDs were standard equipment in essentially every segment.
Matrix LED — finally legal
For decades, the US lagged Europe on adaptive matrix LEDs because federal regulations required physical separate high/low beams. NHTSA changed the rules in 2022 (FMVSS 108 amendment), and by 2024 American buyers could get full adaptive matrix beam systems on the Audi Q5, Cadillac Lyriq, BMW i7 and Ford Mustang Mach-E.
The point
The American headlight ranking — IIHS rates them every model year — used to be embarrassing. Half the cars had headlights rated "Poor" because the regulations froze the market in 1980s tech. Matrix legalisation in 2022 finally let the US catch up. Most new cars now ship with proper adaptive lighting.