One of my riding buddies works at a body shop. When a BMW has a lens nicked, the whole lamp assembly gets replaced. Pull the guts out and with a little work it can be converted to work in a bike. He said that the individual parts, (transformer, igniter, bulb) would run over $700 his cost from BMW. That's per bulb. The hardest part is finding the right place to put the transformer and the igniter. I can't do my high beams because I don't want to shoehorn 2 more kits into undisclosed locations on the bike. We were going to test running 2 bulbs off of 1 transformer, but we really don't want to sacrifice a tranformer if it doesn't work. They will fry pretty easily. Just hooking up the power backwards will fry one.