Attached Link: http://www.applied-synergetics.com/ashp/html/domes.html

Search on 'geodesics.' R. Buckminster Fuller worked all this out in Synergetics. You could scale a geodesic sphere up to the radius you want the lights at, and place one light at each vertex. You can get Dome 4.80, a utility to generate any arbitrary sphere at http://www.applied-synergetics.com/ashp/html/domes.html. Thanks for asking.