Lighting Part L 2010
>
• Fittings of less than five circuit-watts are excluded from the total number of light fittings. These latter two requirements are 2010 additions, although products of less than 5 watts and an output exceeding 400 lumens seem likely in the near future.
The previous exclusion of compact lamps with bayonet or Edison screw caps has been withdrawn as there is less risk of subsequent substitution by GLS tungsten lamps. • For external lighting (attached to the building) there is a choice of not greater than 100 lamp watts per fitting, together with automatic switching controls when there is sufficient daylight and when the location is unoccupied (previously the limit was 150 lamp watts);
• Alternatively, the use of low energy lamps greater than 45 lamp lumens per circuit-watt with automatic daylight control plus manual switching.
For non-domestic buildings, some key terms are defined in the Compliance Guide, but for display lighting, emergency escape lighting and special process lighting, it is necessary to refer to Section 3 in the AD. As before, the recommended minimum lighting efficacies for new and existing buildings are defined by type and situation: • For general lighting in office, industrial and storage
Various Building Regulations documents of relevance to the lighting industry The Building and Approved Inspectors (Amendment) Regulations 2010 Approved
Approved
Document L1A: New Dwellings
Document L1B: Existing Dwellings
Domestic Building Services Compliance Guide
Dwelling Emission Rate (DER) SAP 2009
Approved
Document L2A: New Buildings other than Dwellings
Compliance with Part L does not indicate good lighting practice or even suitability for purpose
areas, the average initial efficacy to be not less than 55 luminaire lumens per circuit-watt (previously 45). For existing buildings, this value can be modified by a lighting control factor in table 45 where automatic lighting controls are employed. For new buildings, no correction should be applied as it is incorporated in the calculation method;
Approved Document
L2B: Existing
Buildings other than Dwellings
Non-Domestic Building Services Compliance Guide
Building Emission Rate (BER) SBEM* Reference Documents – Standards, guides and legislation
Energy Performance Certificate and evidence of commissioning and building log book
*Simplified Building Energy Model 2010 version or other approved software
The format of the regulations is multi-tiered and the number of documents has increased with each edition. The table above shows the structure of the documentation. The legal aspect of the regulations requires reasonable provision for the conservation of fuel and power. Specific detail is provided in either the Approved Documents (ADs) or the Compliance Guides. One major change is that the detail now appears in the two Compliance Guides whereas previously it was part of the ADs. ADs are not intended to be prescriptive; there is no obligation to adopt any particular solution in the AD if some other way is preferred and can be shown to be equally effective.To view the ADs, visit:
www.planningportal.gov.uk/england/professionals/buildingregs/ technicalguidance/bcconsfppartl/bcconsfppartlappdoc
• For general lighting of other areas the average initial efficacy to be not less than 55 lamp lumens per circuit- watt (previously 50); and
• For display lighting the average initial efficacy to be not less than 22 lamp lumens per circuit-watt (previously 15). What is often overlooked is average luminous
efficacy of the area, and so it will vary for each building according to the combination of products used. Places of worship are excluded, but not ancillary
areas such as offices, kitchens and meeting halls. There is special consideration for listed and historic buildings largely as before, and the guidance issued by English Heritage should be taken into account. The area subject to the largest change is display
lighting, with average lamp lumens per circuit watt increased by nearly 50%. Replacements for reflector tungsten filament lamps in this sector are overdue so compliance should not prove difficult. Finally, compliance with Part L does not indicate good lighting practice or even suitability for purpose. It only examines whether the building’s energy performance – including the permanent lighting – is equal to or better than the worst acceptable efficacy as given in the compliance documents. l
Richard Forster IEng, MCIBSE, MSLL, MILE is a lighting engineer. A version of this article is also published in the latest edition of the SLL Newsletter.
34
CIBSE Journal September 2010
www.cibsejournal.com
Shutterstock
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88