EMP daylight?

As this video made by "Matrix Decode" shows, lightning will light up everything near it with a flash of what appears to be daylight.

So perhaps it's really the electromagnetism from the sun that lights up the atmosphere.
Kind of like a fluorescent light bulb.

For more on this with a very interesting explanation by a very brilliant guy, check out this post -

The post also features some pictures of the Devils Tower mountain, as well as a picture of petrified redwood.