What is most likely causing this effect is that the light of a jump point is a single point directly at the center of the portal. For lighting the flat sides of a ship emerging from a portal that means the light source is actually behind the surface, so doesn't light it.
Either that or there isn't actually a jump portal in that shot and the sound is just being played by events so there's more dramatic control of the motion. The sloped aft surfaces should be lit at least, and I don't see that there.
But that first issue is definitely an issue, one that quite bugs me and is as far as I know a form of 'disc light' is relatively high on the list of things qazwsxal may be able to implement in the future.