I just ordered 2 150/175 ARO Electronic ballasts and 2 175Watt SE Ushio 10,000K bulbs! I am going from 2 96W pc tubes to the 2 175 watt Ushios, and 1 96W Actinic PC tube! I was wavering for a long time on bulb wattage and SE or DE! I was going to go with 1 250 watt bulb, but the outskirts of the tank would be dark...so I figured on 2 lesser wattage bulbs. I went with SE bulbs and electronic ballasts because of heat. Finally I chose the 10,000K bulb because I wanted to use an actinic bulb for dawn/dusk...and anything above the 10,000K would have been just as blue as the actinic. I an going to jouranl the crossover from PC to MH/PC with pictures