When deactivating or removing this mod from a save, vanilla nightvision equipment tech stays hidden. I had to use console to bring back vanilla tech.
game.player.force.technologies['night-vision-equipment'].researched=true

Also some other mods require vanilla nightvision item as crafting ingredient, which made me abandon this otherwise really nice atmospheric mod.

That is fair, this is one of my first mods. I think I now have better ideas how to do this. What mods are you refering too that use nightvision as crafting ingredient?

I will take a look to address this issue, thanks a lot for reporting!

Hi, I have 2 mods that require nightvision equipment as crafting ingredient.
Colony Builder for recon and pilot units. FTL Ships for stealth cruiser.

Thanks!, it should be working now!