yes, not much you can found on web about the otto/Nan lights. Correct me if I am wrong, the otto light is from Taiwan and Nan light either from Indonesia or Mainland China. Overthere they use 220 -240V but we need 120V in North America. So if you order direct from them in 220V you need a transformer. I have one in 220V, the transformer weight a lot. You can order direct from Asia to save a few bucks but not worth it. If B-man can get it in 120V that is the best way to have it.
The light tube is sinkable that you can put inside your tank. Otto/Nan light is only for red Areo to increase the color (like the tanning bed in gym). Turn it on a few hours daily and you will see the difference. As I heard that some fish farm in Asia use it on their fish before they shipped to their customers. I only need 6 for my new tank but I order 10 sets with some extra tubes. To get it in 120V for North America is worth for me to keep some backup. I am not a store so I am not going to resell them. A crazy guy in Toronto selling a used one for $250 Canadian.
If you have a nice red Areo , you should go for it. So act now, sign up boys!