From what I've read the 250w HQI is good for a 2 x 2 area that leaces 6'' on each side without good coverage. I'm a little conceerned about heat with the HQI. Rob that fixture you had looks sweet but are only 1 watt leds, and the exotic PAR 38 leds are running at 4 watts which I'm sure would be really good par at sand bed .