light can kinda expand around corners in a sense, so long as there is a light at an angle that matches it without being obscured. Yours is rather intense though for this...
I'm not a master of light, but this is close to imagine how the light might appear assuming that your surface was both smooth and fairly matte (with no sense of course of a z axis, because there wasn't one present)

I know you cannot tile that, but it might help to think about how it would look in a pseudo-real-life setting, remembering that you have 4 sources of light during the day; the sun, man-made emitters, light reflecting off the sky, and light reflecting off of objects.
keep in mind what angles light can come from, and mind your parts of it
