<a href=showthread.php?s=&postid=9859541#post9859541 target=_blank>Originally posted</a> by manofcoral I use Radiums, great color and good growth. It is the bulb that Steve at Reeffarmers uses.
IMO, these are the best 400 watt SE out there..Its almost a must to use the HQI ballast with the Radium. If you use this combo look at replacing the bulb atleast every 6 months if not sooner.
If your using a standard ballast I'd try the 20K XM..
<a href=showthread.php?s=&postid=9863188#post9863188 target=_blank>Originally posted</a> by gtrestoration I don't like the looks of my pieces under the XM at all. It might be over par on the tank I used it though.
SteveU
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