There is a company that sells everything you need for installation business. I don’t know it off hand but if you google Christmas light installation you should be able to find it. Some guys here do it as a biz so they may have more advice.
so basically the two people that responded just wanted to see their names online. both of them basically say I dont know. Why did you bother to answer the post if you dont know. Might as well refer him to google.