What about Solar Powered Lights?

Solar powered lighting is the safest and easiest kind of outdoor lighting to install. Each light fixture contains a scientifically designed solar collector panel that converts sunlight into electrical energy. This energy is stored in highly efficient rechargeable batteries used to light the fixture at night. Solar lights utilize the latest LED technology and provide sufficient light to mark entrances, accent walkways and steps, and to indicate the location of darkened obstacles at night

It is important to understand the limitations so as to avoid disappointment.

Disadvantages: 

Solar lights must have sun during the day to charge the batteries. The length of time that the lights stay on at night are in direct proportion to the amount of sun exposure during the day. Very simply, the better the sun exposure during the day the longer the lights stay on at night. Also, it is important to realize that the fixtures need to be positioned so that the solar panel is exposed to the sun... overhanging trees, shrubbery, your house, shadows, etc. are all potential limiting factors to optimum performance. The lights are usually not as bright as most other forms of outdoor landscape lighting.  Some people feel that this is a disadvantage, however, others welcome the softer more subtle light output that these fixtures were specifically designed for.

Advantages: They require no wiring, are very easy to install, and run off the sun's energy. The "Malibu" range of solar lights turn on and off automatically. When it starts to get dark. The specially designed circuitry turns the light on and it stays on until the battery is discharged or daylight reappears. "Malibu" solar lights do not utilize photo eye controls which are prone to failure in solar lighting applications.