Its engineering some highs in your low beam socket...

http://www.bmwe34.net/E34main/Upgrade/More_light.htm

its a beamer but the mod is the same...

yes, the output will be much brighter, obviously, as you are running a high beam bulb as your low beams. Much luck has been had with the Sylvania Silverstars...and they arent too pricey either...40$ a pair i think?