Using CoronaLightMtl
Use RaySwitch material, plug the main CoronaLightMtl into GI, a less/more intensive to the reflection slot.
Using CoronaLight:
Use the main light, disable visible in reflections. Create another light a bit apart, make it not shine light, but be visible in the reflections.
This is the closest way of doing what you want, and still, it is not the cleanest way, but a possible workaround.
Hope this helps.