Because I had two greenhouses (and a third, temporary, one built in the fall just for some plumeria), I wanted fixtures that had tubes with wavelengths both for growth (6000-6500K) and blooming (2500-4500K). Therefore, I had a mix of tubes in each fixture. For those fixtures with 4 tubes, 3 were the 6500K and one was the 3000K. For those fixtures with 6 tubes, 4 tubes were 6500K and 2 tubes were 3000K. I actually purchased tubes in the spectrum I wanted, 20 tubes at a time, and thus, could arrange the tubes in the fixtures as I wanted. These T-5HO fixtures come with and without tubes. For those fixtures with tubes, the spectrum should be listed, but if it is not, contact the seller so that you'll know what you are getting.
