Fiery Dragon Sword making floor very bright
You probably want to adjust your graphics options (and perhaps those of your graphics card, too). The glow from the FDS is one of its cooler features, imo, since it allows you to easily navigate otherwise dark corners of Tyria.
Consider changing your game (or windows) gamma settings — from your screenshot, it looks like that is turned up higher than most people run them. The FDS glow is barely noticeable for me in areas that have direct sunlight or are locally illuminated.
If that doesn’t work (or you have already tried it), please post what your in-game graphical settings are so that people can more easily recommend other things to try.
Good luck.
John Smith: “you should kill monsters, because killing monsters is awesome.”