Yes you are correct, but I am not wondering about the which light to get.. I am wondering about the quality of their products.. You get what you pay for and there prices are pretty inexpensive.. I guess I am more concerned about the ballast.. It just look like cheesy steel box, compared to some of the other brands.. but if the guts are good then I guess it would be ok, I will probably get a 600WATT to supplement my 400Watt and get more light coverage or use the 600 Watt to FLOWER and the 400 Watt to Veg with some flors.. Thanks for the advice