This credit interpretation request is submitted regarding the applicability of the Lighting Controls requirements in ASHRAE/IESNA Standard 90.1-1999 to a medium security prison complex. Lighting Controls Section 9.2.1.1 (page 49) of ASHRAE 90.1 states that the use of a single control device for all general building lighting is mandatory. Due to concerns about inmate security and staff safety at correctional facilities, a single control device for all general building lighting is not an appropriate design feature. In fact, many products associated with lighting control (i.e., low voltage switching and control stations, occupancy sensors, etc.) do not conform to the Federal Bureau of Prison\'s (FBOP\'s) medium security and tamper-resistant construction standards. Within ASHRAE 90.1-1999, we do note that lighting required for security purposes appears to be exempt from the Standard, as written in "Exceptions to 9.1" point (c) and "Exception to 9.2.1.1". Lighting required for living units appears to be exempt from the Standard, as written in "Exceptions to 9.1" point (b). Although our interpretation is that all lighting controls at this project are exempted from ASHRAE 90.1-1999 for security reasons, the lighting design of this project does follow the North Carolina Energy Code, in lieu of the prescriptive requirements in ASHRAE/ IESNA Standard 90.1 - 1999. The current North Carolina Energy Code is comprised of the 2000 International Energy Code with N.C. amendments that incorporate the ASHRAE 90.1 -1999 standard. There are, however, two significant differences found between the documents (outlined below). We consider the NC Energy Code to be equal or more stringent to the applicable portions of ASHRAE 90.1 - 1999 based upon the following comparison: Lighting Power Allowances - North Carolina Energy Code has lower values than ASHRAE 90.1-1999. Lighting Control - North Carolina Energy Code: bi-level switching in most spaces regardless of size. ASHRAE 90.1-1999: single building shutdown device with individual space override. No dual-level switching in individual spaces. We discussed the two standards with Mr. Gregory F. Mulholland, past member of the North Carolina State Building Code Council. His opinion is that the North Carolina Energy Code was amended to be equal to or more stringent than the ASHRAE/ IESNA Standard 90.1 - 1999 standard. Question: For purposes of compliance with LEED EAp2, will the use of the North Carolina Energy Code for Lighting Power Allowances and Lighting Control be acceptable?