I miss-understood. When you said “…in the settings menu.” I thought you meant for all sources. You’re suggesting Funcom add a slider to every single light source in the game?! Good luck. I think it’s fine as it is, maybe the personal glow of the character itself could stand to be adjustable though.
BTW ~ If you take your game gamma down a few points (from the default 2.2), to 2.1 or 2.0, it may still accomplish what you’re trying to do. Give it a shot, I run my game gamma at 1.9 because my monitor is super bright. The character glow is barely noticeable.