Lowering Brightness

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The "low" brightness is way too bright for me. Microsoft is nice enough to introduced 30 levels of volume but offering just 3 levels of brightness is pretty dumb.

Anyways I was looking through registry hack and I found the MinBrightness and MaxBrightness setting. Originally I set it to "manual" and "low" in the brightness setting. Then I checked the registry and the Min and Max is 0 and 19 respectively.

I changed the Max to 0, and it APPEARED to be dimmer than before. I went back to the Setting -> Brightness and now my brightness level is shown as "Medium", Auto adjust set to off. Both of them are grey out so that I cannot change it, I supposed the setting screen read an unsupported combination and freaked out. I wonder if anyone else tried this, or this is just my placebo effect?

I thought I was the only one having this problem.
Hopefully there will a solution regarding this issue.

I wonder if I can use privacy screen to lower the brightness, or even those tinted window screen from home depot.

So where to tweak this in registry?