Does not work immediately after packaging. Pulled the pump out to clean and the original lightbulb has been there for a long time. It still works. I thought now is the time to replace it with a new one and leave the old one as a spare. I received my Sun Sun Bulb last week so it was a good time to replace it with a new one. Connected - does not work, old light bulb in - works. I went through this process three times. Same result. The new bulb doesn't work, the old one does. I don't know if it's seconds or I just went "bad". In any case, it is non-refundable and non-exchangeable, so for your information. I would not buy from this seller. Find another source. i know i will
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