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E-39 vs EX-39. Why are light bulbs so confusing?

EX-39 has a longer center probe - the bulbs are rated for open fixtures, and it's a safety feature to help prevent someone sticking their finger in the socket and getting electrocuted. It might work, but the bulb won't screw in all the way and if you're not careful you could damage the bulb or the socket.
 
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