You can easily adjust the general brightness and the strange of the contrast for your choice/monitor:
(without loosing the general changes / look and improvements of the preset that much)
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0. Open C:\Program Files (x86)\Steam\steamapps\common\Fallout 4\SweetFX\SweetFX_settings.txt

Lighten dark areas, less harsh contrast:
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1. Go to line 219
2. Change the value here: more negative value = brighter dark areas, if the dark areas are too dark for you

Example: To lighten the dark areas of the game, change #define Levels_black_point -25 to -35 // -15 e.g will darken it.


Lighten the general appearance of the game:
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1. Go to line 295
2. Change the value here: lower value = brighter, if the general appearance of the game is too dark for you

Example: To lighten the game, change #define Gamma 0.400 to 0.300 // 0.500 e.g will darken it.