I have also wanted to attach high output lights for retaliatory purposes but I though it out and figured if someone got hurt it would be jail time for sure. I have looked in some vehicle's owner's manuals while in Saudi and they show the high beam lever as the "passing lever".
Check your manuals and see what yours is described as.

“A lot of the people who keep a gun at home for safety are the same ones who refuse to wear a seat belt”