Energy Efficient Lighting in Shops by decree





Energy Efficient Lighting
in Shops


European Commission

Directorate-General for Energy (DG XVII)
Energy Efficient Lighting in Shops
September 1995

POTENTIAL FOR ENERGY SAVING                                                   • Modern lamp/luminaire technology, in addition to being more
Lighting accounts for approximately 30-45% of total electricity used            energy efficient, also delivers longer lamp life (up to 50%) and a
in shops, depending on whether they are Supermarkets or                         higher quality of lighting, which results in less re-lamping and lower
Specialised Stores. Recent developments in lighting technology                  maintenance costs.
combined with planned lighting control strategies can result in very          • Optical Fibre lighting allows a number of lighting points to be
significant cost savings, typically in the range of a quarter to a third of     serviced by a single light source.This source can be a high
the electricity traditionally used for lighting. There can be additional        efficiency, long life lamp. This technique is particularly suited to
savings in energy consumption where a Store is air conditioned, as              decorative and display lighting. The control gear and lamp can be
the new energy saving technologies produce less heat. In new                    located at an easily accessible location for maintenance.
installations energy efficient lighting costs little more to provide than
the older less efficient kind. In retrofit situations, pay-back periods       • Luminaires which utilise energy efficient lamps and control gear
generally of between 1 and 5 years can be anticipated.                          also produce less heat. This means that less mechanical cooling is
                                                                                required to maintain comfort conditions.
The purpose of this leaflet is to identify these technologies and
                                                                              SPACE CONFIGURATION
techniques and to summarise their benefits.
                                                                              • Maximise the use of daylight to reduce the need for electric lighting.
                                                                                Link the control of the display lighting in the window areas to
      CHARACTERISTICS OF SHOPS                                                  daylighting levels, automating the switching-off or dimming of the
                                                                                lighting to match the ambient lighting level outside the store.
      • Large variety of Lighting Levels and Effects
      • Open-Plan Design Generally                                            • Paint the surfaces of the rooms (including the ceiling) with matt
      • Multi-functional Spaces                                                 colours of high reflectance to maximise the effectiveness of the
                                                                                light output. Light/bright colours can reflect up to 80% of incident
      • Long Hours of Usage
                                                                                light; dark/deep colours can reflect less than 10% of incident light.
      • Colour Rendition Important
      • Staff Lighting Control                                                CONTROL STRATEGIES
      • Restricted Maintenance Opportunities                                  • Lighting control systems are available which automate or group the
                                                                                operation of luminaires in a space. They switch on or off, or dim
                                                                                particular lighting circuits, to match the product display, or the time
     K E Y T E C H N I Q U E S & S T R AT E G I E S                             of day. Such systems select the correct lighting level, thus
                                                                                minimising energy wastage.
     • Utilise the most energy efficient lamp/luminaire
       combinations                                                           • Where tungsten or tungsten halogen lamps (mains, 12V or 24V )
     • Maximise the use of Daylight                                             need to be used, installing a device to regulate their supply voltage
     • Segregate circuits to provide greater control                            and reducing it by 3% will double the life of these lamps.

     • Use light coloured walls and ceilings                                  • Segregate circulation, maintenance and security lighting from
     • Get Staff involved in energy saving planning                             display lighting so that the circuits can be controlled separately.
                                                                                When the public are not present, the display lighting can be
                                                                                switched-off and staff can prepare the store using the most energy
                                                                                efficient lighting systems only (i.e. fluorescent lamps).
• 26mm diameter fluorescent tubes with high frequency control gear are
  25% more energy efficient than the older 38mm diameter fluorescent          • Where there are large spaces with the necessity to have a large
  tubes with electromagnetic control gear. In addition, this technology         number of lamps (either fluorescent or high pressure discharge
  can allow dimming of the fluorescent lamps, which in turn permits the         type) switched on for extended periods, energy limiting devices can
  correct illumination level to be selected, hence efficient lighting.          be very effective. These devices consist of auto-transformers
                                                                                which, once the lamps have been switched on and are stable,
• High Pressure Discharge Lamps are up to 35% more energy                       automatically reduce the voltage/current to the lighting circuits by
  efficient than the 38mm diameter fluorescent tubes.                           10-20%. The consequent reduction in light output is only 5-10%.
                                                                                Savings typically of 30% are achievable, with a pay-back period
• Compact Fluorescent Lamps (CFL) used in place of tungsten
                                                                                of 2-3 years. This strategy is particularly suited to supermarkets
  filament lamps achieve an energy reduction of 75% and an 8-10
                                                                                and wholesale stores.
  fold increase in lamp life. They have particular application where
  lamps are required to operate constantly e.g. corridors, display            GENERAL
  cases, stairwells, toilets.                                                 • Staff should be actively involved in energy saving. Without their
                                                                                co-operation most control strategies will not be successful. Explain
• 12V or 24V tungsten halogen lamps used in place of tungsten or
                                                                                that energy savings are not being made at the expense of their
  parabolic aluminised reflector lamps (PAR) achieve an energy
                                                                                lighting conditions. Properly designed and implemented energy
  reduction of 50-70% and a 2-3 fold increase in lamp life.
                                                                                efficient lighting schemes will not degrade the working environment.
• Metal halide lamps used in place of linear tungsten halogen lamps             It is vital to provide staff with regular feedback on how the strategy
  for displays achieve an energy reduction of 60-70% and a 3-5 fold             is working. Lack of information will breed indifference and the
  increase in lamp life.                                                        potential level of savings will not be realised.

This publication was produced for the Directorate-General for Energy (DG XVII) of the European Commission by the IRISH ENERGY CENTRE,
Glasnevin, Dublin 9 - a member of the OPET Network. The contributions of BRECSU and NOVEM are gratefully acknowledged.

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