What are the interim rules for lighting projects?
Building owners are encouraged under the law to focus first on lighting systems for two reasons: first, their ease and availability of upgrading, and second, the known achievements in energy efficiency that will be gained. In the case of a lighting system (including the retrofit of an existing system), until such time as the secretary of the treasury issues final regulations, the system energy savings target for the lighting system is deemed to be met by a reduction in lighting power density of 40 percent (50 percent in the case of a warehouse) of the minimum requirements in Table 9.3.1.1 or Table 9.3.1.2 of ASHRAE/IESNA Standard 90.1-2001 (as in effect on April 2, 2003). Note that in the case of other building systems (i.e., HVAC systems and the building envelope), partial deductions are generally not allowed until the secretary establishes system targets for such systems. In the case of a lighting system that reduces lighting power density by 25 percent, a partial deduction of $0.30
