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Dear Export manager, I would like to inquire on your sodium dimmable electronic ballast for 250w and 400w.please e- mail information regarding this product. how to dimmed ? how to control? does it have a 1-10v control signal function? will this work with a 1-10v dimmer switch. Is it the same as the dimm of flourescent using the 1-10v dimming control. Thank you Robert Cheng