Mixed

When resistance training sets are performed to volitional failure, muscle hypertrophy gains are similar across low, moderate, and high loads in untrained and recreationally trained individuals.

If you are new to lifting or have moderate experience, you do not need to lift heavy weights to build muscle. As long as you push your sets close to failure (where you can't do another rep with good form), lighter weights (high reps) will build muscle just as effectively as heavy weights (low reps). Focus on reaching that point of fatigue rather than obsessing over the specific weight.