Lighting special Ultra-effi ciency
What UEL should mean ... • A product, by itself, cannot qualify as being UEL ‘Ultra-effi cient lighting’ can only apply to the lighting system as a whole, which means the lighting equipment or lighting solution (lamps/ light sources, ballasts, luminaires and lighting controls) required for the lighting scheme, and its installation and operation during the life of the scheme • UEL includes daylight and how the space is used • It takes account of lighting design, good practice and applicable standards • It includes through-life costs • It is based on BSEN 15193
The New York Times building, which uses a Lutron Quantum total light management system as part of a holistic approach, is an exemplar of UEL, slashing energy usage by 72% in one year. It uses 4W per square metre – a third of the power of a similar modern offi ce building
described as effi cient. The lighting system is taken to mean the lamps/light sources (including daylight), ballasts, luminaires and lighting controls that are needed to light a space. Again, the system must suit the particular location, therefore the lighting design has to take into account issues such as user requirements, relevant regulations and standards, as well as guidance, such as the SLL Code for Lighting. These all form part of the defi nition of UEL. We decided the next step was to agree how an effi cient
lighting system might be defi ned and, more specifi cally, measured (such as lm/W, W/sq m, lm/W/100 lux, and so on). However, it was eventually concluded that there was no point in having fi xed values since technology, standards and design are constantly improving. Finally, it was agreed that to qualify as UEL, the
energy effi ciency of the lighting system should be in the top 20% of the range of the lighting energy effi ciency ratings of installations, made in accordance with a BSEN 15193 LENI estimation (which is measured in units of kWh/sq m/year) for indoor lighting, or BSEN 13201 for outdoor lighting (see box on facing page). This overall clarifi cation has now been approved by the SLL and is subject to formal agreement from the other constituent organisations. Should it be formally agreed, it will become an LLG-approved defi nition. ●
Alan Tulla is president of the Society of Light and Lighting. The UEL defi ntion can be downloaded at
www.sll.org
‘It is well known that for ultimate energy effi cient lighting we need the right light, in the right place, at the right time, provided by the right lighting system’ – Society of Light and Lighting
THE SLL The Society of Light and Lighting, a CIBSE society, is the largest professional body for those involved in the art, science and engineering of light and lighting. It has more than 2,000 members in the UK and worldwide, and carries out a full range of activities, including publications on lighting and a programme of regular seminars and conferences, and masterclasses. The new SLL masterclass series provides insight into how we
can meet the low carbon challenge in relation to lighting. For more information on the SLL, or to book onto the masterclasses, visit
www.sll.org
… and what it could do Mark Glover, head of the Small Business Research Initiative, provides a classic example of equating UEL in a woolly fashion with products: ‘Ultra energy effi cient lighting could transform Britain’s homes and energy use. The more effi cient the lighting, the more money we save on our energy bills. We want to see high-quality, compact ultra- effi cient lighting that everyone would be happy to use at home. We have the opportunity to become a world leader in the manufacture of this technol- ogy, which would create new jobs and boost the British economy.’
www.cibsejournal.com
November 2010 CIBSE Journal
47
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