LIGHTING REPORT
Contents Introduction Objectives Methodology Strategies Results Summary

 Artificial lighting can account for a substantial proportion of the electricity used in a construction village. Appropriate lighting design, including the use of natural daylight, can reduce the energy demand and the associated running costs.

However it is important to note that an improved design process for the lighting system can reduce internal heat gains and thus increase the need for space heating during cold months, but conversely can reduce the need for air conditioning during warmer months of the year.

At the construction site under investigation, no lighting control system exists within the cabins. Furthermore, all lights in a room are wired up to one switch. To switch only a part of the lights on in a room is not possible. This limited control i.e. only on/off switches, of lighting systems in current construction site accommodation is the primary reason for high lighting loads.

Means of saving energy using appropriate lighting control can be:

a)       If lighting rows are located adjacent to windows, they can be controlled by photocells that monitor daylight and adjust the level of artificial lighting accordingly, either by switching or dimming.

b)       Automatic switching which turns the lighting on or off when it senses the presence or absence of occupants.

c)       Automatic switching which turns the lighting on or off at pre-set times.

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 The objectives are to demonstrate to what extent the use of energy efficient lighting devices and/or lighting control systems will achieve reduction of the lighting demand within the construction village. This report will assess whether or not a lighting control system, which encourages the maximum use of daylight and minimises the use of artificial lighting during the times when rooms or spaces are occupied, is an appropriate measure for construction site accommodation, and if appropriate, for which areas is deemed to be most suitable.

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	During this investigation 5 lighting strategies have been identified which are considered to be suitable for use in a construction village. These strategies were identified by focusing on occupancy pattern, visual requirements and current lighting behaviour for different types of rooms.
Methodology Diagram

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            4. Strategies

The five lighting strategies established are listed bellow.

Each strategy can be accessed via a link in the Ligthing part of the Project Web site.

Strategy 1: Installation of 36W Tubular Fluorescent Lamps

Strategy 2: Installation of High Frequency Ballasts on all Luminaires

Strategy 3: Installation of Occupancy Sensors in Intermittent Occupied Areas

Strategy 4: Installation of Automatic Daylight Control in Offices

             4.a. Case Study – Automatic Daylight Control

Strategy 5: Install Energy Efficient External Lighting and Lighting Control

 

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The following table summarizes the results that are gained from the detailed study of all 5 lighting strategies.

It should be noted that installation of energy-efficient internal and external lights are straightforward measures that should be implemented in all construction villages.

Occupancy sensors should be installed in all areas which are not constantly occupied as it saves a significant amount of energy at a relative short payback time. 

Using high frequency ballasts has a very long payback time. However, these are important as an increased source of comfort since they reduce flicker.

The use of automatic daylight control in site offices can reduce the lighting demand to a significant amount. However, its payback period is up to 10 years.

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