In today's day and age of "on the go" it is inevitable you come home at night or you may even leave so early in the morning that it too can be dark outdoors. It would only appear best suited that your residence is as well lit on the outdoors as it is indoors. The outdoor space should function smoothly and in the dark lighting is the only alternative to seeing at night.
It is proven that a well lit home having low levels of light equally balanced throughout the property makes it normally easy to see within the surroundings of the property. Outdoor lighting also allows night time vision of movement to be recognizable.