So, the 2015-17 S550s come stock with HID headlights, which are known to have a delay while flashing to pass AKA pulling the stalk towards yourself to quickly turn on the brights.

The sequence is somewhat like: stalk pulled....delay...brights on for 1 sec....off
It's just not instant. This is understandable because HIDs need to be ignited to light up and this takes time.

Now the question:

I upgraded to full LED headlights from AlphaRex, and these LED's still...

How to get rid of "flash-to-pass" delay on 2016 S550 LED Headlights