I bought from the largest seller on the bay. It is a good unit. I keep all kinds of coral and have great growth. For mushrooms and zoas, the t5 beats my 250w mh for growth and color. For ricordea and acropora, the mh is better. 14000k is supposed to be the closest to natural sunlight, but for growth, as I understand it, the 8000-12000k is supposed to be better. I don't know that to be the case, but have read it several places. I have 10000k and 14000k in my t5 and 14000k in my mh.