The greater the difference between the heaviest load for your highest set of reps and the heaviest load for your lowest rep exercises, the better it is for hypertrophy.
In theory the base should be the lightest load for your highest rep exercises but some wise guy would then think that means that using 0 weight for 100 reps would induce greater hypertrophy, which is obviously not the case.
Many studies have concluded that reps below 4 will induce more strength than hypertrophy and endurance and reps above 18 will enduce more endurance power hypertrophy and strength. By keeping the rep range in the 5 to 15 range, you try and capture the best of all 3 worlds to the extent that averages can. You can always switch rep ranges up if you to when changing cycles to fit what you want to emphasis as Icars has implied.
In theory the base should be the lightest load for your highest rep exercises but some wise guy would then think that means that using 0 weight for 100 reps would induce greater hypertrophy, which is obviously not the case.
Many studies have concluded that reps below 4 will induce more strength than hypertrophy and endurance and reps above 18 will enduce more endurance power hypertrophy and strength. By keeping the rep range in the 5 to 15 range, you try and capture the best of all 3 worlds to the extent that averages can. You can always switch rep ranges up if you to when changing cycles to fit what you want to emphasis as Icars has implied.