The C7 lamp base size is different than the larger old-fashioned Christmas bulb, which is called a C9 and is over three inches long. A C9 does not fit into a candelabra socket, but has its own socket size, which is called intermediate.
Creating a citation for your website in MLA format usually requires you to identify the website author, website title, website publisher, and the date you accessed the information. You'll also need to remember the date you used the website on your bibliography. See some examples here.
Using Quotations, Citing Sources, and Formatting the Works Cited Page. For MLA Citation format, go to Research and Documentation Online. (Highly recommended. This page is meant to be an overview rather than a complete guide to citing sources. See the appropriate sections in your book or the material at the links below for complete information.