There are certain factors which you need to keep in mind. And it comes along with the garden lighting installation prices. However, this will help you with better knowledge of how much money you need to shell out. First, you need to think about the cost of labour. When it comes to installing lights in your backyard, a licensed professional can save many bucks of yours. Second, you need to think about the price of the materials which entirely depends on your choice of items. Next, you also need to keep in mind that replacing the old fixtures takes lots of time than the new ones. Thus, approximately it might cost around $77.50/hour. However, for the downlighting, it might cost almost $67.50/hour. In contrast, LED lighting installation price around $72.50/hour on average.