... our pre/after-sale service. The following is the information of our products.1.Specifications of 400W HPS electronic ... stable quality, longer life time.400V 400w electronic ballasts offered by requests.For more products information, please feel free ... RegardsDavid SongSales ManagerQidong Sunkan Electronic Co.,LTD. 400V 400w HPS electronic ballast for hydroponics/greenhouses,UL,CE,TUV,DIN approved