Lighting Part L 2010
spotlight T
In the
Changes to Part L, due to come into effect next month, will have key implications for the lighting industry, writes Richard Forster
he changes to Part L 2010 of the Building Regulations set out tougher Target Emission Rates (TERs) for dwellings and non-domestic buildings. The Non-Domestic Compliance
Guide tabulates minimum standards for metering of general and display lighting by kWh meters on dedicated lighting circuits, or metering coupled to lighting or building managements systems, or a lighting management system that can calculate and report consumed energy. This will improve information for the building user. Because the aim is to assess the overall energy
consumption of a building, it is possible for an individual product to be compliant in one building but not in another, thus compliance only relates to individual buildings and not products. However, ‘each building service should be at least as efficient as the worst acceptable value for a particular type of appliance as set out in the Compliance Guide’. Section 6 of Approved Document (AD) L2B for
existing non-dwellings includes the requirement for consequential improvements. Among the practical and economical measures suggested in table 6 is ‘upgrading general lighting systems with an average lamp efficacy of less than 40 lamp lumens per circuit- watt… by new luminaires or improved controls’. Later in Section 6 para 11(c) there is a supplementary
requirement when the installed capacity per unit area of a cooling system is increased: ‘Any general lighting system within the same area with an average lamp efficacy of less than 45 lamp lumens per circuit- watt should be upgraded with new luminaires and/ or controls …’ This is to reduce the lighting load and hence the space cooling demand. For dwellings, the changes largely relate to withdrawal of tungsten filament lamps: • For internal lighting, three out of four fittings are to use low-energy lamps (previously only one out of four);
• Low energy lamps to have an efficacy of not less than 45 lamp lumens per circuit-watt (previously 40);
• The fittings to have a total of more than 400 lamp lumens;
www.cibsejournal.com > September 2010 CIBSE Journal 33
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