What is the difference between E39 and EX39 base?
EX39 Mogul Base
The EX39 base has a longer tip base. EX39 based bulbs can be used in fixtures with standard E39 or EX39 sockets.
Bulbs with EX39 bases have protective shields so can be used in either open or closed fixtures.
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E39 Mogul Base
Bulbs with E39 base will only operate in fixtures with a E39 socket but will not operate on EX39 base fixtures.
E39 base bulbs can be used in enclosed fixtures only.