Kinetic, It looks like you would be better off just ordering the standard 250watt Spectra from Premium Aqua, then doing the conversion yourself. Special ordering is not worth it. I have a infiniti that I converted to using a IC electronic ballast and 120v T5 ballast. The problem you will run into is that Giesemann uses 220v ballast on everything and in order to use the fixture in the US you have to use there 120v to 220v transformer, me heat, more space and something else to break. Again my advice, if you are handy is to get the fixture and gut it. You might even be able to find some 54watt dimmable T5 ballast (0-10v). Basically just build your own fixture. HTH