For what it's worth,
When I put on my cheap Chinese Funlove LED headlights I took it out 4 nights in a row to try and aim them right.
I couldn't tell at all aiming at the garage door like with incandescent car headlights.
I have lots of twisty tree lined country roads with no street lights so I could really tell how they were aimed.
Way too high the first few times, pissed off everybody (especially the cars in front of me) and got flashed at constantly
but lit up the road like it way daytime.
I got them just right on the 4th try. They are excellent.