Line voltage T8 replacement tubes.
Someone would have to come up woth a custom config. For the batch. The normal ones are for saltwater. I would think that using the marineland planted as a template would work.
A few other details -
They said that the 36" are discontinued. From what I can tell that applies to the 18" as well. Maybe they could run a batch for us if needed.
I assume that the minimum order would be for 10 of each size.
If someone else here wants to take this over, I would not be affended. I am sure there is someone here who would not only be able to figure out a configuration that would work for everybody, but do more investigating to see if this is even viable (bright enough, compatability...).