You should be reading the new part L
https://www.planningportal.gov.uk/uploads/br/BR_PDF_ADL1B_2010.pdf
.
[If the paperwork for the building regs for the alteration was done prior to 1st October 2010 (very likely) then the old Part L1B applies.
very likely
The new "Part L" of the building regulations now requires that 75% of all lighting is energy efficient i.e 45 lamp lumens per circuit watt. This requirement not only includes new services but also any existing services that are extended. Extra low voltage (12V) or low voltage (240V) halogen fittings will not comply with the guidance and are singled out as not complying.
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