maybe wrong but Truforms settings are pretty much same as mine (read some where u dont need the mapping for world output (but has to be equirectangular) but if you had a dif type of image maybe it could be fiddled lol, my settings let you do the full 360 if u wanted to

 

@unbroken-fighter you have to set the render settings up, default is way to low to get a clean image(intergrator and try at least 500) you can set the preview to 0 an it will render forever (set preview mode to rendered) stop it when its clean an save out then(not tried the saving but u know more about blender then me ), what RV said about lights is true only the sun is "fixed" but can load a plane(anything) and set it to emit and it works like a light

 

have fun an stay happy