K this Evan dude is seriously misunderstanding this.
A person with little to no muscle mass can't come into the gym lifting 8lb weights doing 50 total reps and expect to gain size. Even a huge bodybuilder will just continue to sculpt what he has, might get new little muscles popping up here or there...but unless he's on steroids which maximize nitrogen retention, protein synthesis, etc and counteract catabolism, they won't get big either. As a former huge ass fucking girl bodybuilder I can say this to be true.
On a pretty heavy cycle I BUILT UP to doing about 85% of my maxes up to about 12 reps for a few weeks, then increased my weight and reps simultaneously...but I was on roids therefore no catabolism was in effect.
Now, if they do fewer reps with heavier weight, they'll increas strength which leads to the ability to lift heavier weight which leads to more muscle being built.
This is like chapter fucking one of 'lifting weights 101' - nothing more needs to be said
Good luck to you littlepuma
keep us updated on how it works for you. Hell, if you have time to kill and not a specific time when your muscles need to be bigger, spend 2 weeks in the gym doing light weights with higher reps and let us know how huge you get.