Each lamp accommodates a standard E26 bulb base. (Bulb not included.) Many of these lamps use a harp (the curved frame structure) and finial (the threaded button on top) to hold the helmet in place. Some use a smaller bulb clip and finial in place of the traditional harp. I’ve sourced the appropriate style and height for each lamp base. Typically a lamp shade covers the entire bulb but barely covers the socket for switch access. For all the lamps listed, I have measured from the base of the lamp to the top of the socket so that the basic measurement remains comparative regardless of the type of shade support. Reminder, I will have to drill through the top of your helmet, but since harps and finials are a standard gauge, you can change the base to another style in the future. Note: This is NOT the case if you want to swap to a pendant style cord. That is a completely different size.

