NeptunesGhost
02/11/2008, 12:13 PM
I have had my 48" Outer Orbit HQI lights for about a year. I know that I need o replace the halide bulbs periodically. It comes with 10,000K lamps. Should I use 10,000K to replace, or can I upgrade to a 20,000K? I understand that the K rating is based on the "black anvil" theory, and describes the color or wavelength of the light. Is 20,000K an upgrade or just different? What is best for coral growth?