Sorry, I thought I already responded to this question, but apparently my comment didn’t go through. Anyone who’s been doing Christmas Lights for more than a season will say the same thing: Don’t use customers lights. Best practice is to lease the lights to the customer, you provide them, custom cut them, and then store them. This does several things. 1. When the time comes to install next year, you already have the lights ready to go and working, you don’t have to hope for the customer to find them in a hidden bin in their attic 2. You control the quality of the lights 3. Warm, white, sun, warm, white, there are all different types of brands and slightly different color shades. You stick with one brand and do you have replacements for any job you come across. 4. If a customer provides their own lights, there’s no guarantee on the quality. There’s a decent chance you can’t even custom cut them. Even if you can, if one bulb goes out, there’s no guarantee the bulbs you have will match their bulbs. 5. They guarantee that the lights will stay in great shape. You don’t have to argue about who has to pay for replacing a few bulbs or extension cords. You just have them and take care of it. 6. It is a better long-term profitability, since the lease will typically cover the price of the lights within 1 to 2 seasons, and if you take proper care of them in storage, they should easily last 5 to 7 years without compromising the brightness. 7. I’m sure there are other reasons that I just can’t think of right now Here’s the link for a supplier that does good prices Get pro quality Christmas Lights supplies here: https://www.christmaslightcontractorsusa.com/?ref=lxgxbrab