I just received a couple 250 watt HQI 14k from Hellolights. I tested them out and compared them to my older AB 20k. They have a little bit more of a blue tint. This may be because my AB 20k are 12 months old, but so far the lights look great. I have not set up my frag tank to actually look at growth rates and longevity. I won't have it up and running until after the Holidays. I actually want to compare growth and color to my 120w LED setup.