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This AOB-Scan will lead you to the function which gets called whenever your lightradius-value changes. If you change eax to ebp, you will have fullbright whenever your lightradius-value changes
If you go to the adress which the functions jumps to after that (its 2 lines under the function you find), you are at the line where the value gets written. You can play around with it, it will achieve permanent full bright but with a lot of negative sideffects
I also made a new version. This should fix the "bounces" you have when your life is dropping. What it does it basicly changing the brightvalue and then removes the function which writes to that value. It works pretty good for me, please let me know how it works for you
PoEHack.exe - Speedy Share - upload your files here
Also as littlewolf mentioned, this is for the non-steam-version. It might not work with the steamversion