You need what's called a HID kit, which includes HID bulbs and the ballasts to power those new bulbs. You'll want a CANBUS digital error cancelling kit so that it works plug and play with your car.
you can get a standard 35w HID kit or a brighter 55w hid kit (both are safe for your vehicle since your stock halogens are 55w)
shameless plug: i sell HID kits
If you want just a lowbeam kit for your car, you'll want to hit yes for lowbeam kit, tick the box for canbus upgrade on lows, pick your colour (4300K will look stock, 5000k is the clean white look) and no to fogs and highs.
I run a canadian led kit & hid kit company, if you have any questions about led headlights or hid kits in canada or would like to check out our products please contact me here: http://absolutehid.ca
2002 TiAg M3 6mt
deoranged, dechromed, led tails, ZHP knob, UUC SS v3, GROM, OEM 220M 19's, Michelin Supersports
2006 YZF-R6, bunch of go-fast stuff