I am building a small garage, 16X21 with 12' ceilings. It will have a 4 post lift, PTAC A/C, and I am planning on 12 each 4' T8 2 bulb fixtures in rows of 3 perpendicular to the entrance for overhead lighting. I am thinking of adding at least 2 each 4' T8 on the 21' walls for fill lighting at...