Anywhere in the world, installing LED lights in REFLECTOR housings will blind oncoming drivers. You need LENS housings for LEDs. 

The real problem is the people who buy these LEDs as most of the sellers (including most on Amazon for example) don't make it crystal clear that they should NOT be used with reflrctor housings.   

Enforcement wise, Police should crackdown on this, issue citations and demand that drivers replace the LEDs. And don't use the "it's my right to do what I want" excuse as your rights stop when it affects someone else, and blinding an oncoming driver with potential consequences definitely warrants strict enforcement

... the same applies to those who "boost" the height of their vehicles (mainly trucks, SUVs, etc.). By doing so they are illegal as the lights will shine in the eyes of oncoming drivers and in the mirrors when the are behind. 

Again, the Police turn a blind eye to not "stir the pot" with those who modify their vehicles. Sad, but the only way to fix this is with more enforcement

Ministers urged to crackdown on LED headlights that dazzle drivers