During take off roll, in HUD perspective, I noticed the brightness had a slight pulse to it. This seemed to go away moments after becoming airborne. I happened to be screen recording at the time too.
From what I’ve noticed, the new dynamic lighting has an automatic exposure shift such that when looking at the sky it darkens and looking at the ground it brightens. Same thing with looking at/away from the sun. My guess is that as you were taking off, your center line was on the horizon, which meant that as you began your takeoff roll, the app had you shifting between a majority of your screen being on the ground and in the sky. Thus the appearance of a pulsing light. Hopefully it is something that will be finetuned for the actual release!