The project is a new City and County Courthouse in Denver. Many architectural spaces have high ceilings to bring additional daylight into spaces. To provide the required levels of lighting by IESNA with spaces with high ceilings, additional lighting must be provided. Title 24-2005, the California enegy code, can be utilized for energy compliance for projects in California. Title 24 has a lighting power density allowance for ceiling height. Additonally, a previous credit interpretation ruling found that the ASHRAE 90.1-1989 version of the energy code also had this lighting power allowance for ceiling height. Since Title 24-2005 can be used for energy compliance for projects in California, can the ceiling height lighting power density allowance also be applied to projects that are not in California? Height in feet above finished floor Multiply LPD by 12 or less 1.0 13 1.05 14 1.10 15 1.15 16 1.21 17 1.47 18 1.65 19 1.84 20 or more 2.04 Source: California Title 24-2005
The applicant is requesting clarification whether certain components of the Title-24 2005 energy code can be applied to projects that are not in California. Title-24 2005 energy code may only be used for compliance by projects that are in California. Furthermore, the prescriptive requirements for Title-24 standards may not be applied to ASHRAE 90.1 models, and prescriptive requirements for ASHRAE 90.1 standards may not be applied to Title-24 models. The project may not use the Title-24 lighting multipliers described above for projects that are not in California.