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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 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.

How many string lights can be on one outlet depends on a number of varying factors, including the total wattage of your circuit, the type of lights, the energy needs of the lights, and cord specifications. It’s better to play it safe here to protect your circuit, so figure out the max wattage of your circuit, compare that to the lights, and move on from there. Generally speaking, LED string lights require less energy than incandescent bulbs, translating to a higher number of lights per circuit. 

The cost for professional holiday light installation averages around $430, with a typical range of $220 to $675. However, prices can be as low as $100 for simple projector setups or exceed $1,200 for extensive displays. The total cost depends on factors like the display's complexity, your home's size, labor rates in your area, and the type of lights used. For example, installation on a small, one-story home may cost $250 to $600, while a multi-story home over 4,000 square feet could cost $500 to $1,800. Costs can also be broken down by location (e.g., high roofs at $3.50–$6 per linear foot) or by the type of light strand, with prices ranging from $4 for basic incandescent strands to over $60 for color-changing LED strands.