where can i get a backdrop like this? Was looking for a backdrop (if that's what its called) for a scene i have in blender. If you look at this image you can see a glowing orb at the back of the image, providing light, i think its called a lightdrop but i am not sure. What is this called and where can  i get it?



I have tried adding a sphere with an emission shader and rendering it, then using the compositor to add a fog glow effect. didn't work. what are some other methods?
I would create a material on a plane with a spherical gradient. 



The method to tweak this gradient is changing the colorramp or the RGB-curve.  As you can see, the Fac slider of the RGB-curve is on 2.5. I used it to overexpose the white. 

Maybe it's better to adjust the color in the last step but that you have to test by your self ;-)