You do have some pretty high ceilings there. I think you should consider using a fixture with a higher lumen output, something in the 800 lumen range (12W). Also, 5000K is a very, very white light. Your house will feel like an operating room. I would recommend that you consider either 2700K, which is the color of incandescent at full brightness, or 3000K, which is the color of halogen at full brightness. These color temperatures are more complimentary to skin tones. Please don’t make these recessed fixtures your only source of illumination. Alone, they will make the rooms seem smaller and the people within look older than they are.