i have seen few posts on this topic...so,
first set of audience for Bolly films telugu-tamil films are always different (in south/OS)... so clash is not a opt word actually..
the fact if both films releases on same day...Tubelight will get lesser screens in south than a normal solo release. and spyder will suffer in ROI.
If TUBELIGHT gets WOM like Bajrangi then the loss caused by the screens shortage will be filled in long run....so max affect 6-7cr.
if wom is -ve...will lose even first alloted screens too and loss will be 12-15cr+...
* in both cases spyder wom is hit..