Help adding light map texture to wallpaper

Hello all, I need some help with a wallpaper project I am working on.

I would like some areas of it to glow like the small lights on the control panel in the first wallpaper and the large white areas on the second wallpaper. I have lightmap textures for them but have no idea how to actually go about attaching them so they will show in game. Could anyone help me with this or point me to a tutorial perhaps?

I have attached an image here with some examples of the wallpaper and the lightmap textures to give an idea what I am trying to do. Any help would be greatly appreciated.