The idea that high levels of night lighting provides more safety is false. Do not forget that more light also provides more exposure to the eyes of strangers (see, on this issue: IDA).
Outdoor light pollution is a serious issue, and you should minimize obtrusive outdoor light.
Low-Energy Outdoor Lighting Options
Use the lowest wattage lamp feasible; avoid incandescent lights and turn off the lights whenever possible; consider motion sensor controlled systems.
Incandescents (including halogen lights) should only be considered in systems designed to be used for very short periods of time.
Fluorescent and LEDs (and solar lights) are better options; they can reduce your outdoor energy bills by 75%. You just need to search for the right bulbs, designed for outdoors use.
Low-Voltage Outdoor Lighting
Solar-powered Outdoor Lights.
Low-Energy Lighting Guide
Low-Energy Light Bulbs
Compact Fluorescent vs. LEDs vs. Halogen Lights
Watts vs. Lumens
Using Timers and Other Lighting Controls for Energy Savings
Timers, motion sensors and other controls can provide huge energy savings and reduce electricity bills and night pollution…
Avoid Using Unshielded Fixtures
Avoid using unshielded fixtures. Shielded fixtures will focus the light on the wanted area, and just on it.
In typical shielded lighting, the bulb, lens and other refracting or reflecting elements are housed inside the fixture.
Typical shielded lights are designed to be mounted vertically with light pointing down. These lights are labeled as cutoff, full cutoff or fully shielded, and provide better visibility, less glare, more security and energy savings.
Avoid Discount Solar Outdoor Lighting Systems
Solar-powered lights can be very useful for nighttime navigation and safety. Just be careful with low-cost solar-powered lights; low-cost solar lights are often useless.
Low Voltage Lighting Doesn't Mean Low-Wattage
Low-voltage lighting systems aren't necessarily low-energy consumption systems. They only provide significant energy savings when they use CFL and LED bulbs, and timers, sensors and other lighting controls.
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