Hey, just got my ballast in today and was excited until I tried to plug it in. I ran into a slight problem... As you can see, the left slot on the female is lower and square. Why is this? Bought the cool tube from a local hydro store which he said was for a 400W hps light. The ballast was ordered online; a lumatek 400W / 120V. Is there a connector piece I need to get or will I have to return one or the other. Thanks for the help.