Unzip and place folder "z_Boeing B748i Cockpit -Black-Grey - Green lighting" into your community folder.

If you are using the Salty-747 Mod you will not get the green lighting.  Their cockpit emissive text is that yellow/orange colour which still looks good but green is better.  You have two options:
1. Remove the Salty mod and install this package.
2. Copy B747_COCKPIT_TEXTS_EMISSIVE.TIF.DDS & B747_COCKPIT_TEXTS_EMISSIVE.TIF.DDS.json from my texture folder and paste in Salty's texture folder

So with Salty's mod installed and also installing this mod, the only change is the green lighting turns the yellow/orange colour (urgh).  Everything else works fine.

I have also created the Black/Grey 747 with blue lighting which can be found here https://flightsim.to/file/8110/boeing-b747-8i-cockpit-black-grey-with-blue-lighting. Ensure you only have one of the mods installed otherwise worlds will collide.