This guide provides simple and practical assistance to electrical contractors in understanding the
implications of Part L1 and L2 of the Building Regulations 2000, as amended October 2001, on the design and installation of lighting within buildings. Approved Documents (AD) have been published which contain examples of how the requirements may be met, although alternative solutions that meet the requirements are acceptable. Introduction to Part L

In April 2006 the new Part L building regulations came into effect with the aim of reducing carbon emissions. Now, the Part L regulations require all commercial buildings to produce 28% less Carbon Dioxide than before. Globally, between 25 and 30% of electricity consumption is related to lighting. Since this is an area that significantly impacts Carbon dioxide production it is also regulated.