Consider the difference between perceived value and real value. When a property is appraised, will landscape lighting increase the value of the appraisal? IMO, no it won't. Will it increase the perceived value of the property ... depends. Properties are rarely shown at night, so any perceived value landscape lighting might convey is lost. However should the property be shown at night, then there exists the possibility of potential buyers perceiving value, even if there is no real value in terms of the appraisal. While pictures may help, it is not the same as seeing it with your own eyes. If you want to know with certainty yes or no, then ask an appraiser.
That said, a mature, healthy and well maintained landscape, with or without lighting, will increase the value of the property.