Low Energy L1 Compliant

Part L of the current UK building regulations
Current UK building regulations state (in part L1 of the regulations) that a certain number of dedicated low energy light fittings must be installed within 'new build' UK homes and extensions. Certain rules also apply for 'new build' offices and commercial properties. These fittings must have integrated ballasts within the fitting to ensure only low energy bulbs can be replaced (thus stopping the installation of standard, non-efficient, incandescent lamps in to the lamp holders)
Below is a brief section of the current Building regulations regarding the Low Energy Lights you must install if building a new home, extension, or commercial property!
'A way of showing compliance would be to provide lighting fittings (including lamp, control gear and an appropriate housing, reflector, shade or diffuser or other device for controlling the output light) that only take lamps having a luminous efficacy greater than 40 lumens per circuit watt. Circuit-Watts means the power consumed in lighting circuits by lamps and their associated control gear and power factor correction equiptment Fluorescent and compact fluorescent lighting fittings would meet this standard. Lighting fittings for GLS tungsten lamps with bayonet cap or Edison screw bases, or tungsten halogen lamps would not.
Reasonable provision would be to provide in the areas affected by the building work, fixed energy efficient light fittings that number not less than the greater of a.) one per 25 metre squared of dwelling floor area (excluding garages) or part thereof; or b.) one per four fixed lighting fittings (25%)
A light fitting may contain one or more lamps. Installing mains frequency fluorescent lighting in garages may cause dangers through stroboscopic interaction with vehicle engine parts or machine tools. Fluorescent lamps with high frequency electronic ballasts substantially reduce this risk. Light fittings in less frequented areas like cupboards and other storage areas would not count.
Fixed external lighting means lighting fixed to an external surface of the dwelling supplied from the occupier's electrical system. It excludes the lighting in common areas in blocks of flats and other access-way lighting provided communally. Reasonable provision would be to enable effective control and/or the use of efficient lamps such that:
Either: lamp capacity does not exceed 150W per light fitting and the lighting automatically switches off: When there is enough daylight; and when it is not required at night
Or: the lighting fittings have sockets that can only be used with lamps having an efficacy greater than 40 lumens per circuit watt.