A THERMIE PROGRAMME ACTION THERMIE TECHNOLOGY SUMMARY LEAFLET Energy Efficient Lighting in Shops E U European Commission R 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 LAMPS & LUMINAIRES 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.