Kieran Murphy scored two of five tries as the Scarlets opened their LV Cup campaign with a bonus-point win over Leicester.
Flanker Matt Gilbert, wing Liam Williams and replacement fly-half Jordan Williams also crossed for the home side.
Williams was also successful with two conversions while the man he replaced, Aled Thomas also converted.
Leicester could only manage a lone first half penalty from George Ford.
Scarlets: Evans; L. Williams, Gomer-Davies, Warren, Ford; A. Thomas, Tipuna; John, Myhill, R. Jones, Day, Welch, Gilbert, J. Edwards, Murphy.
Replacements: Gardner, Hawkins, P. Edwards, Timani, Pugh, A. Davies, J. Williams, L. Rees.
Leicester: Morris; Rolston, Forsyth, Symonds, Lewington; Ford, Harrison; J. Harris, Hawkins, Bower, Kitchener, Parling, Pienaar, Armes, Slater.
Replacements: T. Youngs, Bucknall, Balmain, Skivington, de Carpentier, Grindal, Staunton, Mama.