I have seen the light that spirits and angels live in so many times that it no longer gives me pause, having become quite familiar to me. Citing all my experience would take too long, though, so let me relate just a few examples.
I was taken into the dwellings of good spirits and angelic spirits several times in order to learn what their light was like. There I saw not only the spirits but the things surrounding them as well. I also saw babies and mothers bathed in a light of the greatest possible brilliance and radiance.
An intense flame dropped into view unexpectedly, powerfully dazzling not only my physical sight but also my inner vision. Soon a dark spot appeared, like a dusky cloud with something earthlike about it. When I wondered about it, I was taught that the light among angels in heaven is just as bright compared to the light in the world of spirits. Although spirits also live in light, there is a comparable difference between the two. Like the light, the understanding and wisdom of angels is greater than that of spirits—and not just the understanding and wisdom but everything that comes from understanding and wisdom, such as speech, thought, joy, and gladness, because these correspond to the light. As a result, I was able to see how much more perfect angels are than people on earth, whose darkness is even greater than that of spirits.
from Secrets of Heaven, Sections 1522-1524