outdoor light

Hi guys. I’m installing 4 new (not replacement) exterior lights on the outside wall of my home. It’s a smooth stucco wall. I’m thinking I can use a round 1-gang, old work electric box but how do I attach it? Do I need one that secures to a stud? The plan is to install Lutron Caseta smart...

Ok for those that do this for a living I am hoping this is easy. Thx. for any insight/help. Respectfully, plz. read carefully so as to not assume or draw conclusion w/o facts - this is a unique effort or application (I think). :) SETTING = CA, residential, outdoor, 120V/15 amp line. EXISTING =...