normanviking
New member
What bulb do you guys think I should pick? I have a 400 watt Magnetic ballast. I want to change to a bluer bulb to enjoy the colors' of my corals more. The yellow is so annoying. I was thinking about the 20K XM. It has the greatest PAR for the bluer bulbs. On the specteral plot it was higher everywhere then the Radium. I do not know if there are certain wavelengths to avoid though. Thanks for any help or suggestions. Dan