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I've had two Panasonic projectors the 300E and the 900e and now I'm thinking about buying the 4000 but it's really expensiv were I live in denmark. I found it's much cheaper in the US but what's the difference between the 4000U and the 4000E modell.? The specs are the same but the are different certificates. Does it make are difference if I buy the 4000U?