I hope this feature could be added like Max's default lights where we can put a texture Map for the light whatever it was.
or this option could be added in the Corona render frame buffer at least for the time being (gradients, fall-offs, and then other maps ahead) while rendering this would be a great jump ahead instead of stopping the render and going back to 3dsMax and applying the light texture Map and then start rendering again.
in this step, this would be a realtime rendering issue resolve.