Good privacy screen that doesn't reduce brightness? Data?

[AC Question]

There are lots of privacy screens out there that will prevent people next to you from seeing what's on your screen (search "privacy screen LG V10" on amazon for examples). However, a common complaint is that the screens reduce the brightness, so you have to manually raise the brightness and waste battery.

Can anyone offer any recommendations for the best privacy screens that reduce brightness the least? If you have a privacy screen, can you tell me how much brighter you need to make the phone compared to without the screen (e.g. percent brightness change)? I know that's not easy to do, but I'd appreciate whatever information I can get.

Note: I have an LG V10 phone.

 

[mhinc]

Just a question, do you really have that much need for privacy, I guess I mean, are people hovering over your shoulder constantly that would see personal, private data, to the point you need this?

 

[spydersilk]

Porn lol