I currently keep a scrapbook of each lighthouse I have in a photo album. On the left I have created a Word document which shows a picture of the actual light and the HL and the specifics such as when/where purchased, edition size and serial number. On the right I keep the COA, tent card and any other cards/special items that come with it. I have also started to printand include the pages out of the National Maritime Initiative Inventory of Historic Light Stations websites for each lighthouse so that I have all of the specific info available at my fingertips.