old 400w bulbs

[Bryan]

I don't have anything in front of me but if you search radiums on reefcentral, there is some lengthy threads on radium and ushio bulbs and the ballasts they run on. Because many of the 10k bulbs are European they apparently will run under a HPS ballast and supposedly last longer. I know I did fire up the Ushio with the 430 watt Son Agro HPS and it started faster and with less flicker than the 400 watt MH, As expected it also burned brighter and whiter.