I run both halide and ebay leds (most leds were converted to bridgelux 3w bulbs) I use 3 250 watt xm 20k bulbs and 4 black box leds with blues running at 80% and whites at 30%. My par readings in a 29" deep tank with all lighting 10" off the water is 250-350 in the sand bed. I had great growth and great colors under this.l, Holly can vouch for that