One of the largest factor to consider to determine the cost of Greenbrier Christmas light installation is the size of your house. Keep in mind that more space in your home that you want to be covered, the higher the cost of Christmas light purchases and labor that you will spend. The other determining factor for your Greenbrier Christmas light installation cost is the type of lighting that you will use. It is advisable to use LED lights instead of regular lights because they are proven to last longer and shine brighter. They are also cost-efficient as they use minimal electricity. However, they are costly as compared to other lights. But keeping in mind the money that you will save on electricity and replacement, it will definitely be worth the buy in the long run. Lastly, the wirings that you will use in your Christmas light installation should also be considered. The length and cost of wirings and extension cords that you need to buy will depend on the area that will be covered.