There is a modest collection of lamps on this site that anyone is welcome to browse through to help identify any lamp they are interested in.
However, a free identification service is offered to those who have purchased a copy of Lighting the Ancient World. All that is required are clear images of your lamp from both above and below (a side view may also help in some circumstances), and the dimensions in terms of length, width and height in millimeters (see below).
I can't claim to be infallible but with over twenty-five years of both collecting and studying lamps, as well as quite an extensive library on the subject, I can say that I can give it a good go. Just one caveat - this is a service for the odd lamp or two; I can't give judgment on entire collections other than by special arrangement.
To enquire further or to send your images contact firstname.lastname@example.org
L-~-~-~-~-~- Contact - email@example.com ~-~-~-~-~-L