<a href=showthread.php?s=&postid=15335285#post15335285 target=_blank>Originally posted</a> by SunnyX
Growth with MH is a sure thing. I never ran Radiums but I did run 20K XMs which were close in color and with higher PAR.
I think a combo of XM10K and ATI Blue+ bulbs would be great. If I decide to go with a larger tank soon I may have to use a couple MH's as running 100% T5 on a large tank can be tough due to the 5' limitation here in the USA. I cant wait until we get the 6' fixture like the ones in Europe.
From what I have seen and read the Radiums provide more pop then what the XM 20Ks do.
I previously ran Reeflux 10k bulbs and man were they REALLY bright. They were almost like looking at the sun or something. I used two T5s for supplementation and I have to say you could tell a difference because the 10K just dominated. I have a feeling this would be the same with the XM 10Ks. What I was surpised to find is that my growth was as good with the 20K Radiums as it had been with the 10K Reeflux bulbs.