what the heck is negative light.
all the lights are inside spheres and the cylinder.
how ever you had hdri set i used it. adding color to lights brings out colors and conteracts wash out. or haveing lights inside colored obj,s in this case both but not nesasarly the same color light in the same color obj.
the first radial light i ever used inside something is in daz bryce  gallery. think 3-4th light i ever used.