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If you are willing to go to using a 12V LED and a converter, there is a simple and cheap conversion for lights that have the opening in the back. I used a 4W 480 lumen chip-on-board LED intended for use as car dome light to convert my blow molds. I just stick the COB on the circular plate and run it from a 12V converter. You can hide the converter in the base of the blow mold or as I do run a bunch of the blow molds off one converter located in my garage. The lines can be inexpensive speaker wire since it is low voltage and isolated from line current. My local second hand stores have 12V converters from electronics goods for a dollar or less. My penguin was missing the light cover so I made one from a can lid.
Santa using the same light.