So, I made a connection, Kallus is likely very light sensitive.
Our guy has Amber eyes.
---And his descriptions involving light are things like this:
---General knowledge of Amber eyes gives us this:
---And also from personal experience, I also have Amber eyes:
--- I can tell you that even if it's cloudy in the middle of the day, I have a really hard time keeping my eyes open cause it's painful/uncomfortable. Low light conditions like dawn and dusk really are the most comfortable.
Thought it was kind of neat information to share about how Kallus likely interacts with his world and now I completely headcanon that he's very light sensitive. 💛
Highly recommend reading the kid's book Star Wars Rebels: Battle to the End. Takes place when Kanan is captured. Some of the chapters are actually from Agent Kallus' point of view!!