I have a 3-4" Idaho grape cap growing under (2) 250 watt SE 15K MH (XM) on a PFO ballast supplemented with (2) 75 watt URI VHO actinic on an IceCap 660. It is about half way down in the tank (110 gallon). It is very very purple. I have had it for about 3 months now with no change in color...
