Considering the newest Halo can lights. I have already used 18 of the Halo 4" in some rooms. But now Halo has 2" and 3" that put out the same amount of light. Our ceilings are 10' 6" high. Thinking the 2" would be best which delivers up to 800 Lumens in 5 selectable color temperatures: 2700K, 3000K, 3500K, 4000K, 5000K with a 90 CRI.