I have a dual power supply magnetic ballast that supports two 250W MH fixtures. I am fairly new to the MH scene and I am curious as to which ones I should use. I was thinking either the 14k or 20k look. After reading a lot of stuff out there. They say the closer to 10k you get the better the growth for coral. I would still like some pop from my corals though. Reading reviews it seems Radium is the best bulb to go with as far as quality. But it requires a ballast I do not have. XM and phoenix seem like decent bulbs as well but I hear that they dont actual appear at the spectrum they say they are. 14k's seem more like 10k's and so on. Does anyone have recommendations on a good bulb for a magnetic ballast? Hopefully not too expensive. This is just to hold me over till I can save up for LEDs. Thank you.