LED low beams are standard in the USA, but not everywhere.
The issue with LED bulbs is that while they may not be using as much energy, they do generate some significant point heat loads, and if that isn't managed well, will overheat and burn out prematurely. SOme high power LED bulbs come with cooling fans, some with significant heat sinks, and there just may not be room behind the protective cover to fit well, so you need to select carefully. Also, at least in the USA, any bulb used for exterior use is supposed to be DOT approved. The fact that it fits is by no means an indication that it actually passed. Now, will someone stop you and give you a ticket because of it? Probably not, but the way our legal system is, it is one more avenue for liability should you get into an accident, and people are looking at any reason to sue you. (Like, his lights were too bright, or I couldn't see him at this angle because the beam pattern wasn't right, etc.).