Just as title says has anyone done this reverse conversion? I've honestly wanted to do this getting some nice black housing's then putting in some really bright LED bulbs which i have really good experience in having them. I feel like the LED aren't bright enough for my liking and i feel like I can get brighter and further light with the bulbs I can get. the question is if it's even doable since harness maybe a bit different and my platinum also has the auto light turn on and off.

 

A total waste of time as voltage requirements mean you will burn out many bulbs for substandard lighting. Assume you have a 2019 plus model year. My 2019 lighting was far superior to my 2016.

 

Did your 2016 Maxima also have the stock LED's to compare to he 2019 maxima LED's? or where they the halogen? to be clear i wantto use the halogen headlamps and use much brighter LED bulbs that are better than the stock 2019 LEDS.

 

LEDs for both 2016 and 2019. The factory LED on the 2019 is quite an improvement over 2016. Both cars were Platinum's so the refractory design is a bit different from the halogens and the lights "throw" illumination differently.