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I was not familar with this kind lamb and base style and I was overwhelmed with all the variations and price spreads and spent a lot time trying to figure out what to order but the simple diagram of the base configuration was the key to my order. I have no way verify longevity but the bulb is very bright . The original lamp was over 5 years old and was lite at least 12 hours a day on average hope I get 1/2 the life .