Hey Cromophore, The 6 bulb 4 foot light has four 2700K bulbs and two 6500K bulbs. The two foot 2 bulb sidelight is 6500K, so I am mixing spectrums.
The 4 plants are all clones from the same original Mother, but a couple of them may be "clones of clones", I don't recall exactly. Some do seem to "stretch" more than other's, but none are very tall. ( I LST them to prevent that, but it's just a stumpy strain I guess). The ones under the HPS are the tallest I have grown, besides mama plant. She is a Bush, I really need to pull her out and take a pic...and do some pruning!

Forgot to add....the internodes are much closer together on the T5 girls, it shows in a couple of my crappy pics. I really need to take better pics....I have the camera and ability, but it's always late and the effort lacks as a result. Lol