I find 6500 - 10000k Iwasaki and Ushino to be 3X brighter bulbs when compared to 20k bulbs but just god offally ugly, so I go with the fake 14k that looks closer to a 20k. Alot less blue light and PAR and don't make coral grow as fast. Since I have no intention to turn on the 200w of actinics and kill my chiller, i just use 14k and supplement my coral growth with no Sr or any kind of trace elements.
How about you? What bulb you use and why?
How about you? What bulb you use and why?