I have a typical system for rendering light probes, where I render a cube map at the probe position, and then project the cube map onto SH. I render the lightmapped world geometry into the cube map, which captures indirect lighting from the lights in the lightmap.
I'd also like to capture direct lighting from the lightmap lights. To do this, I was thinking I'd render a sphere with the light's color/radius/position in the cube map for each lightmap light. Is this the right idea? Am I missing anything?