i have a nice 6 tube t5ho fixture. if you are getting it to flower you will be disappointed, even with the bloom spectrum bulbs. however i consider them to be really great for vegging. for flowering you are going to need quite a bit of side light. i just finished my first hps grow and there was really no comparison. with the hps i pulled well over a zip per plant with fewer watts than my previous floro setup. i'm in the middle of building my veg tent so i can set up a (somewhat) perpetual grow using t5 for veg and my 400w hps for flower. if you are used to hid lighting and you switch to a t5 it will be a downgrade, but they make absolutely awesome veg lights with almost no heat.