Im not sure, but I did find this thread regarding the same subject.
http://www.gm-trucks.com/forums/topic/154593-hid-lights/
Although the OP of the thread stated that when he ran regular H11 bulbs he didnt see a shadow, you can clearly see the shadows on the street in the picture labaled "very bright".
Then he shows pictures of the H11B bulb up against a garage door and it doesnt have as clean of a cut off line as the H11, but he doesnt have a picture of the H11B on the road.
Is any one else here running H11B bulbs?