At TSA's coral farm we still run 400w radiums for a few hours a day on our grow out systems.
Its important to note, if you are using 250w Radiums you really should be running them on pulse start magnetic HQI ballasts, E ballasts will fire and run them, but you wont get that "Radium Magic" that everyone loves.
I might have a few old 250w radium bulbs from my old system I might be able to send if interested.