Here's ONE thought. LED headlights might look good behind them (to the driver), but their total beam pattern seems to be "everywhere" rather than focused down the road as E-code lights tend to be. So while we get into the feeling of safety as they are so bright near the car, seeing well down the road for safe high-speed driving at night is not there, by observation.
As a point of refence, next time you're somewhat alone on a two-lane or Interstate highway at 60mph, with the lights on low beam, look for the fartherest reflected item you can see. Then count the seconds until you get there. 60mph = 88ft/second. Do the math. Then compare that to the stopping distance from road tests for your vehicle (found online, as at www.wildaboutcarsonline.com
). This is for "reflected" items, then look for non-reflective items (which might be a street sign or animal near the road's shoulder. That will be a shorter distance. End result is that if traffic density was not what it can be, such driving would be far worse than driving with the old 1960s sealed beams at 55mph at night, on a low-traffic road.
One other observation, from my own experiences, is that as people age, their tolerance of what I term "high contrast light situations" decreases. It is one thing to be blinded by an oncoming vehicle's old aimed-too-high sealed beam high beams, but quite another for a normal LED or "daylight" spectrum brighter normal headlight beam at night. Whether oncoming traffic or approaching your vehicle from the rear. Especially in a more rural setting! In many more-metro settings, there can be enough ambient light at night to dull this situation a bit, but not completely nullify it.
In any headlight retrofit, it's BEST to find lights which fit into what you now have, rather than having to modify the mounting hardware of the vehicle. Due to the existence of the native mounting and aiming mechanisms of the vehicle. Realize, too, that LED lights (for all of their efficiency), DO generate a good bit of heat (hence the heat sink dissipating vanes on them. Even a normal H4 halogen bulb's wiring gets hot, just as a matter of course.
So, as neat as some of these aftermarket headlights might seem to be, they can cause others on the road more grief as they innocently drive down the street. Best to "cause no harm" than unintended consequences, to me.
I might be a bit biased as I've experiences these things myself, as a normal driver that didn't ask to be placed in these "blinding" situations, fwiw.
Having noticed these things about 10-15 years ago, I've sought out and actively use eye nutritional supplements, which have helped AND I've learned to dodge those situations when possible. But when a new F-150 came up behind me in my 2005 Impala (which is NOT a low-to-the-ground car by any means), with all SIX forward lights on (the headlights and the fog lights all had higherpoower bulbs in them!) on a semi-dark city street, at a stop sign. Suddenly, there were all sorts of crazy shadows, made by the lights with my car in front of that pickup truck. The headlights were at the same level at the inside rear view mirror, which did not help anything either! So with all of the light level contrasts and shadows, I had to carefully look past the distracting shadows before I pulled out from the t-intersection.
Just a normal 2wd F-150, lifted with wide wheels and such. Looked nice, but that was when I noticed the level of many late model pickup trucks' headlights in relation to my inside rear view mirror's height. In casual conversations with friends who are younger than myself, they have noticed some of the same things. So this is nor an isolated situation, by observation.
I'm not against better headlights, but LEDs and projector beams are not a part of that mix, to me.
Sorry for the length, but I feel this is an evolving situation for many drivers.