Dark screen when playing Black mesa

screen really dark.
tried mat_hdr_level 2
mat_tonemapping_occlusion_use_stencil 1
still can barely see

Try using mat_monitorgamma_tv_enabled 1. This ups gamma. Oh and try using mat_dxlevel 95 for flashlight if it doesn’t work either. I think that certain specs of a computer effects the way brightness is handled. Happened to me. Just make sure to put those two codes every time you reload the game. But it worked for me. Edit: also it seemed awhile since you posted the comment, so I don’t know if I am being redundant here. If I am, sorry.

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Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.