I can't remember whether it's ascending or descending pyraminding for strength gains.
ascending -heavy weight low reps then decrease weight and increase reps.
descending - low weight high reps then increase weight and decrease reps.
Some programs such as the 5-3-1 (popular strength program) also follow a similar protocol with lower intensity working sets building up to a 1-5 RM, followed by accessory work.
I always though pyramiding meant (and what usually is done)
ie. doing 135 lbs X 12, 225 lbs x 10, 315 lbs x 8, 405 lbs x 6.