I haven't looked into them recently. Last I looked, the Solaris systems would have taken me something like 5 years to recover the cost versus a MH/PC combo fixtures replacing the MHs every 6-9 months and the PCs every 9-12 months. Like I said, they CAN grow plants, but the initial outlay is still way too high to even try them, for most people anyway. Now, if you're comparing to T5HO, especially with the longer lamp life and much lowered current fixture costs, it's T5HO, hands down. At the time, the only real T5 quality fixtures available were Giesseman, which were way too expensive to conside even over MH/PC.