5 in one with box
The term "bulb-holder.html" seems to refer to a specific HTML file or webpage related to a bulb holder. HTML is a markup language used for creating web pages and documents that can be viewed in a web browser.
Based on the term "bulb-holder.html," it appears that there may be an HTML file or webpage dedicated to providing information, instructions, or perhaps even an online store for bulb holders. It could include details about different types of bulb holders, their features, installation instructions, and possibly product listings.