Just to throw my two-cents in...
I was super stoked when I bought my Oddysea lighting rig. It had two sets of florescent tubes, each with their own built-in timer. Plus it was super cheap when compared to other set ups. A great deal, right!?
I was not so stoked a couple months later when one of the pairs of lights completely stopped working and Im not sure the cooling fans EVER worked. I also had a lot of trouble keeping plants alive with it, but to be fair I knew next to nothing about growing aquatic plants at the time.
What I learned from this (and some other experiences) is that buying something because its cheap often ends up costing you more money in the long run because you'll probably regret the purchase and end up replacing it with a better, likely more expensive, product anyway.
Mind you, Im not saying that just because something is more expensive automatically makes it better. Just maybe do more research than I did before making important purchases like "lighting for plants" and "injected CO2 systems".
