Melos 'light' type is used more in high temperatures (spring or summer), for 'smooth' playing or solo in chamber music.

Melos rosins are tested to function effectively under any condition, for every single instrument.

You can mix different types of rosins to have the results he/she really wish. For example, a violin player can mix a violin MELOS 'light' or 'dark' rosin with a viola MELOS 'light' or 'dark' rosin