Drawing a comparison from a friend, Teks are great but the Aquactinics are much better designed. He switched from a Tek 8 light to the Constellation 7light and using the same bulbs less a 10,000k, the corals look much better in color and physical appearance.
I have the 72" on order but have been waiting since mid Feb for my LFS to get them in from the Canadian distributor. As great as they are, my patience is wearing thin.