Simple control of emission without affecting source appearence.
Quite surprised how light wrapped Sphere just from front direction.
But object is not lighted from front (black faces in center), because there is not any light behinde camera.
(Same seen in Electric_Wizard's answer).
You would probably want to use the image as World material mapped for Camera window (Texture coordinates > Window).
Illusion of environmental light you can quite quickly fake by extending original image by mirroring and a bit of repainting to eliminate sun light from backside (to create like 360 panorama image). Since its just for envi light you don't have to care to much.
Camera Properties > Lens > Focal Lenght 17 brings envi texture into original image horizontal range view. Compensate vertical distortion you can in Texture Coordinates node Scale Z like 6, but lightning looked better without, so I left it.
Note: Pay attention to a node type - for Camera Window its Image texture for envi light Equirectangular texture