What is the difference between an E26 lamp base and an E39/Mogul lamp base?
The difference between these two bases are their sizes. The E26 is a traditional, standard sized light bulb base - what you would normally find in your side table lamp. An E39 - or Mogul - lamp base is the same type of base as the E26, but is larger in size, both diameter and height. E39/Mogul bases are traditionally found in fixtures where the wattage required for operation is higher.