What should be noted when retrofitting car headlights with LED lights?

[Zoe]

Because LED lights have poor heat dissipation, if not properly handled, it can greatly affect the car, so a heat sink should be configured. Single-bulb LED lights need to be equipped with a lens; otherwise, it can cause severe scattering. LED lights are very bright, which can easily dazzle oncoming vehicles at night, making driving unsafe.

[VonTucker]

I learned the hard way when modifying LED headlights, and now I recommend everyone choose light sources with 3C certification. It's best if the heat sink base comes with copper pipes. Last time, I bought cheap, low-quality lights that suffered severe lumen degradation within six months, making night driving feel like driving blind. When installing, never just stuff the bulb in—always check if the dust cover can seal properly, or rainwater will seep in and ruin the wiring. Most importantly, adjust the cutoff line height to no more than half the wheel height. Setting it too high will blind oncoming drivers and is dangerous, plus cops might pull you over and issue a ticket. After the mod, test the beam pattern against a wall—good LEDs focus light without scattering. While their rain and fog penetration isn't as strong as halogens, it's still adequate.