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

There are many types of Christmas lights to choose from when working with a light installer. The main types available for outdoor lighting are dome, LED, incandescent, and C9, and your lighting professional’s choice will depend on the location and overall design. 

C9 lighting is typically the most expensive option, ranging from $15 to $70 per 25-foot strand. These usually have fewer bulbs per strand, so you might need more than expected to cover a large area. Dome lighting is usually the most cost-effective option, ranging from $6 to $15 per 25-foot strand. These bulbs are smaller and rounder than other options, creating a softer look.

No, you should not leave LED Christmas lights up all year. While the LED lights themselves are very durable, their wiring and casings can be as vulnerable as any Christmas lights. They’re subject to drying out, experiencing cold or sun damage that causes them to crack, and even damage caused by gnawing pests. (The same is true of incandescents.) If you want your lights to last the years that they’re rated for, bring them inside after Christmas is over. 

Yes, you must use an extension cord specifically rated for outdoor use to power outdoor lights, such as Christmas lights. Extension cords intended for indoor use lack the protective properties to withstand exposure to outdoor elements. To safely hang and power lights outside your house or in your yard, always connect them to an outdoor power source using an outdoor-rated extension cord.