User's Manual

14 Introduction
• Reduction in carbon dioxide (CO
2
) emissions – in one installation, by 70
tons per year (corresponding to the 45% reduction in electricity use).
• Lamp failures can be identified within hours, reducing average lamp
downtime by as much as 90%.
• Alarms can be triggered when lamp voltage exceeds recommended levels,
preventing future lamp failures.
• Reduction in lamp replacement costs – for one installation that uses
electronic ballasts that regulate high-pressure sodium lamps, lamp
replacement costs were reduced by 20%.
• Because software enables most operations to be performed remotely, the
number of onsite maintenance operations can be reduced – in one
installation, by at least 30%.
The SmartServer as the Segment Controller can serve as a gateway for a variety
of devices types. It provides:
• Universal connectivity for devices attached to it, making data available to
a city’s IT system.
• Local device monitoring and control through built-in scheduling,
alarming, and data logging applications.
• An astronomical clock, which is used to automatically switch lamps on
and off, thus reducing lamp burning hours and saving energy (compared
to a fixed scheduler or to photocells).
The SmartServer is the streetlight segment controller and logs and reports lamp
failures, lamp behavior (dimming level and voltage), energy use, and burning
hours. It could also collect information from traffic and weather sensors to adapt
lamp dimming levels. The astronomical clock switches lamps off and on
depending on the position of the sun. Lamps are dimmed at a fixed time, using
the SmartServer’s internal scheduler, during low activity hours at night. This
highly efficient method of controlling light levels results in significant energy
savings. Lamp lifetime is extended due to the way electronic ballasts regulate
the lamp.
Examples
Cities, counties, and other local authorities need ways to contain their expenses
and limit local taxes while increasing the level of service and security they
provide to citizens.
For example, the portion of the United Kingdom budget that is related to
streetlight services is estimated at more than UK£ 280 million per year, of which
40 percent is spent on energy. As another example, the electricity costs for the
city of Los Angeles, California, with 270 000 streetlights, is estimated at over
US$ 17 million per year. Streetlights are the main electricity consumer in a
modern city.
In Milton Keynes, U.K., the managed street lighting system includes dimming
controls that lower light output by 2 lux between the hours of 10 PM (22h00) and
5 AM (05h00). As a result, the city has reduced its electricity use by 30%.
Furthermore, Milton Keynes installed white light lamps that, in addition to