Base defense advice

Hi. I've got six torchposts covering any point in my stonehedge wall, soon to be a brick wall. I can easily add 6 more torchposts as well, my question is how much is enough? Will 12 torchposts and a brick wall deter everyone, or should I add in a few braziers as well? I want to be able to keep out even tough raiders, bar those who have a personal vendetta against me and are absolutely desperate to break into my base (I'm aware that if someone strong really wants to get in, they will).