Hi there

I'm pretty sure SuperFly can be used only with Gamma Correction and Gamma Correction is what we are see and is correct way how to render,same can apply for FireFly and IDL,you should render with IDL and gamma correction is well worth it

in yours case I would suggest,did you used BB EnvSphere or EZDome,if not I would use this and regarding the weird hotspot,this is what I found out few months and few days back again

I would suggest to use area light and try aim light on floor or use -90 and use large scale for light,usually is big as ceiling or you can try to use other lights,but with spot light or any other light you will see this hot spot,but same can apply for area light as well,other option is to use mesh lights

Hope this helps

Thanks,Jura