Here is my config file for the 737-800 for FSLabs Spotlight.
The original lighting system in the PMDG NGX in my opinion is too bright and it does not look natural compared to this one. Older 737NG have a warmer cockpit at night compared to some newer ones this gives it a more classic and dim look.
If you like them please like below.
You will need to have FSLabs spotlight to make this work.
Simply add the INI file to your
Sim Directory/Simobjects/Airplanes/PMDG 737-800NGX WL (or PMDG 737-800NGX)
FSLabs will recognize the ini file and then you can control it on the Spotlights menu.