Outdoor Night Lighting

Parking lots, street lights, building facades
  1. To save energy for outdoor night lighting, one needs to find the most effective way to reduce the unnecessary time that the lights remain on due to variations in daylight times due to seasonal changes.
  2. A single unified approach based on using only daylight sensors is not practical because there are many different ways a space can be used and each geographical area has different daylight times as well.
  3. The lighting for building facades, landscaping or park lighting, can be divided into the following control methods:
    1. Important circuits with long service times: early on, late off
    2. Secondary circuits with short service times: late on, early off.

Traditional Approach

Timer Based Approach

Timer shortcomings
Shortcomings:
  1. Cannot compensate or adjust for seasonal changes
  2. The timer needs to have its battery changed
  3. When its cold or raining, the lights will turn on even if no one is occupying the field.

Daylight Sensor Approach

daylight sensor shortcomings
Shortcomings:
  1. The evening turn off time cannot be set.
  2. The lights remain on even when no one is occupying the field late at night.
  3. When its cold or raining, the lights will turn on even if no one is occupying the field.

Improved Approach

The circuits are split according to areas and the turn on and turn off times are varied according the month.
monthly adjustable energy saving switch with daylight sensor based approach

Evening Ball Field

Ball field floodlight

Ball Field Floodlight

  1. The floodlights are a very important part of any ball field lighting, the brighter the lights the more energy consumed.
  2. There are times when no one is playing in the field because it may be raining, it is too cold or it is a holiday, and yet the lights remain on.
  3. The times the light turns on should vary by season, and in the evening the lights should turn off at a definite time and shouldn't wait until morning light before turning off.

Ball Field Improvement

Monthly adjusted energy savings switch with daylight sensor approach