The sharp cutoff is one of the worst aspects of the LEDs... Well so are brightness and blue-white blindingness... They are just all-round terrible!

But the sharp cut-off provides a flashing effect whenever a car hits a bump, and if there is enough chromatic aberration in the lense the cut-off includes red and blue bands, so they even flash like emergency vehicles.

HID's and the wrong lenses... I'll share. Like 10 years ago, my car was a 20 year old pile. It's was great. My headlights were basically unusable at night. I got brighter bulbs a few times, and finally got the brightest HIDs I could source. They were adjusted right. I had to buy a safety torx driver to adjust them slightly in grad school after someone hit my car. I never got flashed. I knew the housings were yellow, but new ones cost too much and the ones at the salvage yard were yellowed too, but not as bad as mine. Anyway, I was visiting my parents and went to my mechanic buddy's house. We were talking and he saw my headlights. WTF duder? Those are the most oxidized shitty things I've ever seen. Let me fix that for you. At work I get $300 a set to do these on a semi. So he polished them up and clear coated them. I drove home right at dark. I no joke could see a stop sign light up over a mile away in one particularly downhill spot. The roads in that area are gridded by one mile so it's easy to tell distance. The reflections off the road signs I drove past were blinding me. I went to napa the next morning and got normal bulbs. It's a really low population area, so I never met anyone, but I was worried I was going to. It was absurd like an airplane light or the brightest offroad lights I'd ever seen. We had just bought my dad a $600 or something absurd brightest spotlight made for checking cattle and these were brighter.