they're not 1200, 1200 includes ballasts and bulbs. If you have stock Xenons you just swap your bulbs/ballasts.
Figure 600-700 for the clear housings, I've done this on e90's before
On Order: ED - 2016 SO M3, SS Extended Interior, 6 MT, 19" Black Wheels, Adaptive M Suspension
Current: 2012 335iS
Past: 2006 e90 325xi, 2010 135i