Reefconcept confirmed they have the 1x80W Mark 10 ballasts (they are 2 x 54W ballasts wired in series). I will order through them. Icecap told me that they never heard of the term fast strike. Google gives me nothing as well. I don't really understand the concept either. I suspect the only concern is that the metal contacts and such in the end caps can handle spikes. Who ultimately directed this requirement? Did it come from GHL?