If you are planning to upload your own PDF, you may use any fonts you like, but you must embed the fonts in the PDF before uploading to Lulu. If you are planning to have Lulu convert your document to a PDF, be sure to choose fonts from the following list. If you use a font that is not on this list, the Lulu converter will substitute one of these fonts in its place. This may adversely affect your formatting.
Follow these general guidelines when choosing your fonts:
See also: How do I embed fonts in a PDF?