If you just replaced those 2 files that came with each modification the mod works fine. Just remember to restart FH. Each one of those modifications has those files in it that change the light effect. If you want the old fh mane back you should consider downloading fh again and just copy-paste-ing 2 files back to feralheart-media-textures the file names are: fmanelight; fmaneshade (those are in JPEG format)
If you want to skip the download fh again thing. Just message me I will send you those 2 original fh files.
Hope you get this fixed