[stephane]

I tink this comfire what we read before the PFO regular is not enought for the Radium you need the HQI(430 agro) or the blueline

another ting is that if we take steve tiree study in consideration he state that 100% of the radium
light is absort compare to 40% of an iwasaki so
maybe you coral will react positive even if it look dim. I tink you should try it on your regular ballast for a bit only to see how realy
you coral will react it will make a very good point IMO about the Tyree study

Anyway I tink a 400 for you 170 is definativaly not enought but we will find.

How about the temps doug the ting I am a bit afraid in my 130 whith 3 radium is the heating issus I hope I will be able to not run any chiller that my great fear

By the way what kind of reflector you have whith
the Radium? I ask this because after upgrade my flat refector whith the spider tipe I see a very big diference in light and not just in light 2 more degree in temp water those reflector done what they are made for reflect all in the tank!