Your warm - up can consist of sets going from 15 reps to 10, then to five, three and finally a one - rep maximum attempt. (fitnessandpower.com)
To figure out how much weight to use, you'll need to determine your one rep maximum in each of the four lifts. (lasting-weight-loss.com)
So yes you need to be training power, and yes it is smart for general power to work from 1 - 5 reps for about 40 - 60 % of your 1 rep maximum for most exercises. (rugbystrengthcoach.com)