It's one of those quests where I suspect that the graphical team might have been working with calibrated HDR and/or OLED displays and forgot to switch out of it. Because I've had IPS panels before and this quest really was basically no detail at the lower level, it was basically darkness, nothing was visible without blowing out the gamma or brightness. Once I grabbed my OLEDs however, the quest changed drastically. No longer was the lower levels as dark as before and all the details were visible.
I suspect the same graphical team might have been part of the Exalted Angel (current) Ring of Fire. If it's all calibrated for HDR and on an OLED where there's no adjustments needed and brightness is uniform and colours normally not visible are more clear here (without being blown out by brightness or gamma), what players have been experiencing (too dark, lost details and too bright all blown out) might be related to this. Unfortunately there's no way to know this.
As for lighting, I doubt we'd get any more lighting, especially dynamic lighting. As we lost the Archon lighting and never got it back. The only option I can suggest to players with access to Searing Light and the Enlarge Metamagic Feat, is to fire it anywhere and it'll act as a temporary light source. If you do not use Enlarge, the duration of the spark is too short. But if you do have Enlarge, it's easier to use as a light source as the spark stays for longer. Note that this doesn't light up for other players (on their screen), only yourself.
J1NG