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.
This article describes 2016 MLA Web citation style (MLA Handbook, 8th ed.). The new eighth edition, released in 2016, has instituted several significant changes over previous editions. Among the changes are these: The medium of publication (Web, Print) is no longer cited.