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.
Citation Help for MLA, 7th Edition: Formatting Your Paper. MLA has a number of rules that your instructor may want you to follow. The following information came from the 7th edition of the MLA Handbook. See the page number that follows each style rule for more information.