Sadly the metal halide comparator is apparently gone since Sanjay isn't involved outside of Radions anymore....that'd be the place to check.
I also used the Hamilton 20K and it was pretty decent. XM 20K also. I didn't even mind the Coralife 20K.
Thing is the Radiums are almost unique in that they run at a higher than nominal wattage for the 150w and 250w models (off the top of my head 170w and 270w real usage)...as a result they're going to look different than anything that only runs at an actual 150w and 250w. The phosphors literally have a different glow at the lesser wattage....even the Radiums themselves look quite different if you run them on a ballast that limits them to an actual 150w or 250w.
I think I remember that Ushio's might also run hot like this, but I've never seen their 20K bulb.....people I know that were into Ushio always spec'd their 10K.
All that just to say you're probably only going to get so close to the look of a Radium, so don't get your hope up so high that you're totally disappointed by the alternatives. (If that's a risk.) The phoenix you were running was fairly close too, judging from commentary of others.
