so - i am talking 2.4 inch/sec. and mabye 2s exposure time per pass with the short 4W unit. (Mabye 5" useful length)
This was figured at 150 GPH (or 2.5 GPH), 30 Deg. C Water.
I can reach this flow number as I might plumb the light as a kidney loop or use it in a machine tool
Actual flow through my system is much slower and I can easily adjust for that -should I figure out how to get this in my case and into my primary loop. Thus the (exposure time) / pass will be even higher.
I am looking for the magic figures on UV lethality vs. Algae & Bacteria. -Then I am going to need to figure average intensity...