I find starting heavy works you harder.If you start light then you are not pushing yourself in the first couple of sets, the ONLY way you can reach failure is by doing loads of reps, this is good for cutting or tone up, but if you want to bulk, lift as heavy as you can for about 6-8 reps and deacrease the following sets as needed.This way every set is worthwile and not just an excuse to piss through the first couple of sets.Like ive said though if you are tonning up and not worried about adding mass then do light weights for about 15 reps.
The only positive i would say with starting light is it warms your muscles up good and injuries are less likely to happen.
PS just my present opinion which could change depending on feedback from this topic, if someone could state the pros and cons from starting light i might give it a try.
PPS interesting topic, especially for novices like myself.
