The best replacement for light weights is heavy weights.

The best alternatives to light weights are rated as following:
★★★★★  heavy weights
★  heavy
★  heavyweights
★  lifting heavy weights
  heavy weight

Your alternative for light weights is not listed? Suggest!
Speaking about light weights, one probably shouldn't forget about more reps.

Other search terms related to light weights and their ratings are:
★★★★★ more reps
★★★★ high reps
★★★★ lots of reps
You have in mind a companion for light weights and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of light weights in all years. Click on graph for more.
light weights
heavy weights
heavy