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Radium 20K there is no better
OH OH the ballast that a bulb is run on makes as much difference as the bulb itself.. I have seen the exact same bulbs look horrid on weak or underpowered Ballasts yet scream "Gorgeous" on a proper quality Ballast.
If you're after insane growth, a 10k is the way to go. After about 6 months, you'll get tired of the colors and decide you want something bluer. You may try a 14k, but will quickly realize that the PAR is not so great (unless it is a Phoenix or Aquaconnect). When it is all said and done, you'll finally converge on a Radium 20k SE driven with an HQI ballast or an e-ballast that's adjustable or overdrives the bulb. There really is no going back. Everyone I've ever convinced of this fact has been eternally grateful, and if you want the best of all worlds and the ultimate ability to tweak your color, get one of the adjustible e-ballasts.
Iwasaki 15K- Hands down.