Lighting issue with The Guild 2

[Nao-Nauno]

Issue Overview

I am one of the administrators of the Reforged mod for The Guild 2: Renaissance, and I am trying to use your amazing Blender addon to modify interior scenes~ but I am struggling with lighting information :/
The Guild 2 places dynamic lights in interior scenes using Gitse Editor (developper editor tool which I have access to) as an external file that is loaded automatically in-game. I believe the issue is with the export of the scene in Blender, something seems wrong as the lights are not properly working with exported scenes.

Steps to Reproduce

1. Load a .nif interior scene in Blender
2. Export the .nif interior scene
3. Replace existing scene in TG2:R's files with the newly exported .nif interior scene
4. Lighting information not exploited correctly

Expected Result

The lighting is not supposed to create this crazy bloom effect.

Actual Result

The lighting is seen with an explosive blooming effect all over the textures.

Before (Gitse interior view, using the original interior scene)

After (Gitse interior view, using the newly exported interior scene)

In-game view (Using the newly exported interior scene)

Blender project file

Blender File
I can provide the .nif and texture files if required, but there is a lot of textures.

Nif File

Original interior scene .nif file

Textures

Note: there are a lot of textures, perhaps this will be enough otherwise I'd have to upload the whole Textures folder of the game.
Townhall interior scene textures

Thanks for your help ;;