by dbg31415 | 2025-11-18 17:47:13+00:00
> Lately, I see a lot of drivers who turn on their brights and just leave them on and this includes cars with the older halogen and even incandescents. This is a change in behavior.

Something has changed in how we use headlights, and not for the better.

Historically, drivers behaved very differently. When "brights" were actually rare and reserved for dark stretches of highway, you'd dim them the moment you saw another car approaching. Often that meant switching to low beams when the other vehicle was more than a thousand feet away. Courtesy and safety were the norm.

The technology has come a long way. Early headlights in the 1880s burned oil or kerosene. Acetylene gas lamps followed, and electric lighting appeared in the early 1900s. For decades after 1940, U.S. regulations froze headlight design into a two-lamp, 7-inch sealed-beam configuration. That rule unintentionally limited improvements in beam shape and brightness. Only in the 1970s and 1980s did halogens and replaceable-bulb designs become widely permitted, which opened the door to much brighter and more varied systems.

Then came the xenon era in the late 1990s and early 2000s. High-Intensity Discharge (HID) lamps felt futuristic at the time, but they were also infamous for their glare, especially when installed into housings not designed for them. This is where "riced-out" aftermarket kits made things worse. People would drop cheap HID or later LED bulbs into reflector housings built for halogen. The result was scattered, unfocused light that looked bright from the driver's seat but created a wall of glare for everyone else. That trend never fully went away.

Today, Federal Motor Vehicle Safety Standard 108 (FMVSS 108) governs headlamps. It sets minimum performance requirements and basic definitions for high and low beams, but it does not impose strict limits on maximum brightness or color temperature. The old "300 candlepower requires a dimmer switch" phrasing still floats around, but there is no tight federal cap on lumens or color warmth. States can enforce aiming requirements, but in practice they rarely do. Nobody is pulling cars over with a light meter.

Modern LEDs changed the equation again. They're efficient, crisp, and extremely "white" (actually "blue") which makes them appear even brighter to human eyes at night. Complaints about perceived glare have been climbing for years, and there's no shortage of real-world examples of it in the wild. https://old.reddit.com/r/fuckyourheadlights/

Automakers tried to help with automatic high-beam systems, but these were designed to detect oncoming headlamps, not pedestrians. If you're walking your dogs at night, the system may not dim because it "sees" nothing to react to. Many drivers rely on auto mode and never manually intervene, so they cruise around blasting full brightness without realizing it.

My workaround is simple. I carry a high-power flashlight and give a quick shine toward cars running high beams. The auto-dimmer interprets it as another vehicle and drops to low beam. It also alerts the driver that something is off. Plenty of neighbors have told me they had no idea their headlights weren't dimming. (Teslas are by far the worst offenders.)

This is the flashlight I use:

https://www.costco.ca/infinity-x1-7000-lumen-flashlight.prod...