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Christmas trees need about 100 lights per foot, so you would need 700 lights for a 7-foot tree. 

Yes, you can synchronize Christmas lights with music to create a DIY light show. To do this, you will need several components. For hardware, you'll need standard holiday lights, decorations, lawn ornaments, tools, outdoor-rated extension cords, a computer, and a light show control system or digital controller. You will also need specialized software to program the show; popular options include Light-O-Rama (LOR), Vixen, xLights, and Animated Lights. Some, like Vixen and Animated Lights, are considered more beginner-friendly. The process involves using the software to program your lights, choosing an audio method such as speakers or an FM broadcast, and testing the entire system to make sure it's working correctly before the show.

First of all, don’t shop for bargain lights—often, you’ll end up with a faulty or broken strand, full of dead bulbs or less-than-luminous brightness. Choose quality lights that will last you many years—LED lights have been known to last as long as 100,000 hours. Second, plan ahead and purchase lights for next year’s Christmas during this year’s post-holiday sales. Finally, have a vision and a plan—if you know the measurements of your home, including any windows, doors, and outside bushes you wish to light up, you should be able to only purchase the necessary lights and not more than you need.

You can tackle hanging Christmas lights yourself with the right tools, accessories, and a trusted friend or neighbor. You’ll need to purchase a ladder ($100 to $300), clips ($10 to $20), hooks ($10 to $15), and lights ($25 to $100 per string).

Otherwise, you should hire a trusted holiday light installer near you. You’ll pay an average price of $200 to $650, but you’ll have peace of mind knowing that the job is done correctly and safely.