If the various ways of devotion, hearing and chanting, etc., are executed in awe or apprehension of the authoritv of the scriptures then that is called Vaidhi-bhakti.
The inclination to execute the process of devotion according to raganuga is engendered by eager desire, whereas the inclination for Vaidhi stems from a sense of being obligated to adhere to the authority of the scriptures.
The meaning of the word raga is an intense craving to see the Deity form of the Lord and hear about His pastimes from the Tenth Canto of Srimad Bhagavatam.