Generally speaking, from what I learned, your suppose to go heavy and light.
As stated in GoPro's article here
Untitled Document
There are 2 categories of muscle fibers, fast twitch and slow twitch. With high rep range you target the fast twitch, and with high intensity low volume you target slow twitch.
Personally, my routine is as follows:
week 1 - heavy,
week 2 - low intensity high volume (rep range)
week 3 - super heavy
week 4 - unload.