whats the difference between these two
http://www.hellolights.com/index.asp...l=&strCompare=
http://www.hellolights.com/index.asp...OD&ProdID=1349
i know one's a retrofit and the other is just a ballest,but i thougth vho's were the same as t5's, i always thougth they were t5 vho's,can someone explane all this to me?
what i want to do is have the best out of these two for my tanks blue supplement.