Sounds like an lcd TV you have there....there's brightness settings but no blacklight. That'd be like me telling you to turn the temperature down on your telephone
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No it's a plasma I do have a led upstairs but Mabey the backlight setting on the plasma is for something else it goes 0 to 20 I run it at 13 because it's in a low light room
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That should be panel brightness, it's not a backlight it's basically adjusting the amount of power and brightness coming from the cells themselves, so yes it does affect brightness but it is not a backlight