Not Too Bright
April 23, 2026
Alex KiersteinBrighter headlights are not the problem, you're being blinded because of a rule that only exists in America.
Few things can unite all Americans, a desire to not be blinded by the glare of oncoming traffic is one of them. Bright headlights that allow drivers to see more of the road at greater distance are safer. Of course, when those same bright headlights are directed in the eyes of other drivers, that’s unsafe.
Technology that prevents this, yet provides directed light at a much greater intensity away from traffic, exists. It’s on sale! And yet, the regulations around headlight safety ironically make this adaptive beam technology so rare in America as to be virtually nonexistent.
What do I mean by adaptive beam technology?
It’s not my fault; the term is kind of ambiguous. There are curve-adaptive headlights on sale in the US, and there have been for years. These are DOT-compliant lamps that can turn laterally in the direction of steering inputs to help put the approved light pattern in the right place. The light output or pattern of illumination doesn’t change, merely which way the lamps are pointed. You turn the wheel to the right, the lights turn to the right. It’s decent tech, but it doesn’t do the same thing as the other type of adaptive headlight I’m actually talking about.
I’m also not talking about adaptive high beams, which are conventional high beams paired to a light sensor. All they do is switch the headlights between high and low depending on whether the sensor detects oncoming cars. Cadillac had it all the way back in 1952. Nifty, but not adaptive in the same sense.
Adaptive beam headlights, sometimes referred to as matrix lights, have many light-emitting diode (LED) elements that are essentially little bulbs. With a big array, or matrix, of them, you can turn them on or off in various patterns to increase or decrease the light going to a certain part of the total illuminated area. It’s a clever, almost intuitive, concept.
Imagine a dark, two-lane road with no street lamps. You’re driving with the high beams on, to see as far ahead as possible. A car approaches. Instead of turning the headlights to low beam, reducing the light reaching the entire lane and shoulder, an adaptive system could only turn off the elements that would dazzle another driver by pointing in their direction. It just drops the lights to create a litle blacked out spot for a driver ahead of you or one coming in the other direction. The other LEDs, pointing at the road directly ahead and towards the shoulder, would stay extra bright. Helpful for spotting people, animals, or objects that might be in your direction of travel.
The same goes for curves. Adaptive beams can flip the LEDs on and off to do the same thing as curve-adaptive beams, but with the added benefit of increased intensity in areas that don’t present a glare risk for other drivers.
Prior to 2022, these were illegal in the United States because Federal Motor Vehicle Safety Standard 108, which was about a half century old, required that headlights had just two modes: high beam and low beam. The lights were also required remain entirely on or entirely off in either high or low position, so blending wasn’t allowed. Because adaptive beam headlights used high and low beams at the same time and turned off portions of the light emmitter to accomodate other drivers, the safer headlights were illegal.
Can you buy a car in the US with adaptive headlight beams?
Yes, there are several. You just can’t use most of them. Some higher-end cars, particularly from European brands, sell DOT-compliant headlight assemblies that are capable of adaptive beam party tricks. They’re just not legal to use here, because they don’t meet the DOT’s stricter requirements for the technology. So, while the hardware may be present on a given car, it’s probably software disabled.
It took years of lobbying by automakers and safety advocates and a literal act of congress to do it, but the rule was changed in 2022. Unfortunately, the new rule was vastly different and more strict than the rules that have allowed better headlights to be operated safely in the rest of the world for years–even with much higher legal output levels. In most cases automakers would have to engineer entirely new lighting hardward just for the US market to offer adaptive beams here, which means it’s a lot cheaper to just turn off the adaptive features on cars they sell in the U.S.. So you’re out of luck (unless you’re willing to jailbreak them, so to speak).
As of this writing, two automakers actually sell usable US-compliant headlights: Rivian, on the R1; and Tesla on the most recent Model Y variant. From the user and reviewer videos we’ve seen, it works well. I haven’t tested it myself.
Why does the US have a different standard?
Great question. There doesn’t seem to be any evidence-based reasoning I can find, in any of the analyses of the NHTSA adaptive beam regulations, that justifies its divergent and strict rules for the technology. NTSHA has said that some adaptive systems create too much glare and its requirements do call for a number of limits and restrictions, that in a world where they didn’t keep Americans from getting safter headlights would not necessarily be bad.
In this world, most observers and experts agree that the requirements are onerous, excessive, and unnecessary. And that they result in headlights that aren’t as safe or effective as the European ones. Per CNN, even the Society of Engineers (SAE) standards are looser than what NHTSA adopted.
What Happens Now?
For most people, nothing. These matrix-type adaptive headlights are a luxury car feature; even if NHTSA grandfathered in all of the disabled US-market adaptive headlights and adopted the rest-of-world standards, this isn’t a huge number of vehicles. We’re talking about models from brands like Polestar and Audi (which made a huge marketing push on the fancy headlight tech).
That said, these things tend to trickle down eventually to mass-market vehicles, and I expect as the cost of the equipment goes down and the economy of scale improves, you’ll see them on more vehicles. But how many manufacturers will be willing to develop a separate version of the technology with much different attributes just for the US market?
After all, this isn’t simply a matter of lenses, as it was in the past. I used to have an NA Miata, and its weak round sealed-beam headlights drove me nuts. I dropped in some Hella E-Code 7-inch lamps with replaceable bulbs. The result was much better lighting and a sharper cutoff, and I properly adjusted them against a wall so I wasn’t inadvertently blinding anybody. It didn’t meet FMVSS, but also, was it really unsafe? I don’t think so. Certainly safer than all of the folks driving around with off-road LED light bars on full blast, with their headlights off at night thanks to Christmas-tree-bright gauge clusters and DRLs, or folks not realizing their high beams are on.
Adaptive headlights require electronics, sensors, and software, and apparently it’s not so simple to update the hardware (or software) to run rest-of-world lights to US spec.
I don’t think anything will happen, honestly, and that’s a shame. Unless NHTSA revisits the standards, or automakers reluctantly invest in developing the tech for our market, it’ll be another innovation enjoyed by every country except the United States.
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