In my example light source is mesh plane with emission material assigned, to point light I've rotated mesh, light direction is pointed by Z normal of mesh, you can use any mesh, just assign emmit material
Standart blender lamps are not working in corona
Depends on your scenarion you can use mesh lights, Corona Sun\Sky, HDRI, or all together
Use sun lamp to point Corona Physical Sky
Use Environment Rotate option to rotate HDR map