AU-L Ballast 600w (AU) 1)Quiet 2)Long lasting reliable quality,suitable for the high-quality. AU-L Ballast 400w (AU) ITEM NO.:15201047N.W(KG):5.6G.W(KG):6DIMENSION(CM):35*16.5*161.Compact design - saves more space2.Quiet operation 3.Higher performance and longer life AU-L Ballast/Hydroponics ballast/400w (AU)