It's a 16 bulb 4' T5HO, that's all I'm using. Prior to the Connoisseur, it was another AN base Sensi Bloom. They have entry level, middle and high end base flower nutes. I have pretty much used AN since I started growing, back before the new pH Perfect formulas. Lots of mods on here using AN now, I think I created a bit of a buzz when the pH Perfect came out. :smoke: