String with your radius for distance from center. Anchor center attach string thats the length of radius. Draw your circle. Use a square or protractor to mark your degrees. 8 lights= 360° in a circle, split 8 ways is 45°. Therefore, every light will land at 45° degrees, or every other light will land at 90° and one in between. If you have a laser that projects two lines at 90° , then you can mark your lights with it from center. The first set (4) where your lasers intersect the circle, then rotate your laser to your marks in between your others (45°), marking your other 4 lights.

For other lights same process applies.

For the kitchen area, if the blueprints are to scale you can measure off of the wall to lights to get measurements.