Son Agro - What bulbs next?

[EmilyB]

I have 400w Son Agro ballasts currently running radium 20kk bulbs.

For starters, I'd like to know what other bulbs you have run on these ballasts, your opinions as to intensity and lifespan ?

[Aquattro]

I run the Ushio 10k on them, and they are realy bright, nice color and they've been running for a long while. I would guess a year is easily reached with these.
I also ran one of the Sun Aquatics bulbs on the SA for a day and it was too blue, but more a light blue rather than what you might expect.