Genesis: Light Generator is a Blender add-on from Jeff Lange that makes lights in your 3D scene using artistic color controls. It combines 6 color modes, 3 layout modes, and 5 light types with 8+ customizable settings, so you can dial in a setup by hand or generate one with a single click.
The color modes cover Range (a hue value between a minimum and maximum hue), Complementary (two hues 180 degrees apart), Triad (three hues 120 degrees apart), Monochromatic (one hue), Split Complementary (three colors with secondary and tertiary hues +/- 160 degrees from the primary), and Analogous (five colors on the same side of the color wheel). Layout modes include Sphere, which places lights equidistant from the selected object; Top Sphere, the same but above the horizon (+Z); and Grid, which arranges lights above the object in an outward-spiraling pattern.
Light types run from Point and Sun through Spot, Area, and Plane, the last using an emission shader from a mesh plane. Documentation is included and a demo video is available.