Okay, I got these LED headlight bulbs, and getting them into the socket on my Scion xA is going to be a trick - the "neck" between the flange and the heatsink is too short to easily allow the wire retaining clip to be put into place. Never mind the rubber boot that covers the stock bulb - just fitting these into place will be a chore.
I did put in the passenger's side one (without clipping it in) and powered it up. It is quite blue/white and pretty bright, and seems to have a well focused beam. The driver's side on my car requires the 12V battery and the fusebox be loosened and moved a bit to gain a bit of less difficult access.
This may have to wait for a warm day when I can figure out how to get them installed securely. Some of the housing might have to be cut away so the wire clip can be moved into position?