Overview of ..
The lighting design procedures recommended by the Energy Efficiency
Manual will result in lighting efficiency that substantially
exceeds the requirements of the most stringent energy conservation
standards. Still, it is essential to be aware of building code requirements.
This brief Note describes the general types of lighting efficiency
standards and it provides a snapshot of the more prominent standards.
In response to the energy shortages of the 1970’s, many engineering
and legal guidelines for lighting efficiency were developed. Because
of competing concerns, there is no universally accepted approach
to lighting efficiency requirements. Lighting conservation standards
are diverse and still evolving. Their advantages and disadvantages
are explained in the Note.
Construction codes are a major vehicle for lighting efficiency
standards. In the United States and some other countries, the dominant
efficiency standards is ASHRAE Standard 90 (currently called ASHRAE/IESNA
Standard 90.1). Some states that are particularly aggressive about
energy conservation have developed their own lighting energy conservation
Tables of illumination levels for different types of activities,
expressed in footcandles or lux, were the first widespread approach
to mandating lighting efficiency.
A newer method is the “lighting power budget,” which
specifies the lighting wattage, in watts per square foot or square
meter, that is allowed for different types of activities.
Some construction codes include efficiency standards for certain
lighting components, including lamps, ballasts, and controls. Similarly,
some nations have laws that mandate minimum efficiencies in the
manufacture and importation of certain types of lighting equipment.