The people a user is presumed to know or be associated with may be determined using a number of techniques. In some embodiments, this includes accessing, by a client, a first repository of virtual machine disks, selecting a virtual machine disk from the first repository, using a file level referral to redirect the client to a second repository, receiving the selected virtual machine disk from the second repository. The lamp mount selectively and controllably moves one of the lamp and the at least one spare lamp into the lamp alignment position.