Rating System

LEED BD+C: New Construction, LEED BD+C: Core and Shell, LEED BD+C: Schools

Rating System Version

v3 - LEED 2009, v2 - Schools 2007, v2 - LEED 2.2

Inquiry

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